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                                                                 EXHIBIT 4.2
                                                                 EXECUTION COPY

                                  $180,000,000

                          Ultrapetrol (Bahamas) Limited

                 9% First Preferred Ship Mortgage Notes Due 2014

                          REGISTRATION RIGHTS AGREEMENT

                                                             November 10, 2004

CREDIT SUISSE FIRST BOSTON LLC
Eleven Madison Avenue
New York, New York 10010-3629

Dear Sirs:

         Ultrapetrol (Bahamas) Limited, a Bahamas corporation (the "Issuer"),
proposes to issue and sell to Credit Suisse First Boston LLC (the "Initial
Purchaser"), upon the terms set forth in a purchase agreement of even date
herewith (the "Purchase Agreement"), $180,000,000 aggregate principal amount of
its 9% First Preferred Ship Mortgage Notes Due 2014 (the "Initial Securities")
to be unconditionally guaranteed on a senior secured basis by the entities set
forth on Schedule A hereto (the "Guarantors") and secured by assets pledged by
Maritima SIPSA S.A. ("Maritima"), Riverpar S.A. ("Riverpar"), and UABL S.A.
("UABL S.A.") (Maritima, Riverpar and UABL S.A. the "Pledgors"). The Initial
Securities will be issued pursuant to an Indenture, dated as of November 24,
2004, (the "Indenture") among the Issuer, the Guarantors, the pledgors named
therein and Manufacturers and Traders Trust Company, as trustee (the "Trustee").
The Issuer, the Guarantors and the Pledgors are collectively referred to herein
as the "Company". The obligations of the Issuer, the Guarantors and the Pledgors
in this Agreement are joint and several obligations of the Issuer, the
Guarantors and the Pledgors. As an inducement to the Initial Purchaser to enter
into the Purchase Agreement, the Company agrees with the Initial Purchaser, for
the benefit of the holders of the Initial Securities (including, without
limitation, the Initial Purchaser), the Exchange Securities (as defined below)
and the Private Exchange Securities (as defined below) (collectively the
"Holders"), as follows:

         1. Registered Exchange Offer. The Company shall, at its own cost,
prepare and, not later than 60 days (or if the 60th day is not a business day,
the first business day thereafter) (such 60th day, or the first business day
thereafter, being a "Filing Deadline") after the date of original issue of the
Initial Securities (the "Issue Date"), file with the Securities and Exchange
Commission (the "Commission") a registration statement (the "Exchange Offer
Registration Statement") on an appropriate form under the Securities Act of
1933, as amended (the "Securities Act"), with respect to a proposed offer (the
"Registered Exchange Offer") to the Holders of Transfer Restricted Securities
(as defined in Section 6 hereof), who are not prohibited by any law or policy of
the Commission from participating in the Registered Exchange Offer, to issue and
deliver to such Holders, in exchange for the Initial Securities, a like
aggregate principal amount of debt securities (the "Exchange Securities") of the
Issuer issued under the Indenture and identical in all material respects to the
Initial Securities (except for the transfer restrictions relating to the Initial
Securities and the provisions relating to the matters described in Section 6
hereof) that would be registered under the Securities Act. The Company (i) shall
use its reasonable best efforts to cause such Exchange Offer Registration
Statement to become effective under the Securities Act within 150 days (or if
the 150th day is not a business day, the first business day thereafter) (such

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150th day, or the first business day thereafter, being an "Effectiveness
Deadline") after the Issue Date of the Initial Securities and (ii) shall keep
the Exchange Offer Registration Statement effective for not less than 30 days
(or longer, if required by applicable law) after the date notice of the
Registered Exchange Offer is mailed to the Holders (such period being called the
"Exchange Offer Registration Period").

         If the Company commences the Registered Exchange Offer, the Company (i)
will be entitled to close the Registered Exchange Offer 30 days after such
commencement (provided that the Company has accepted all the Initial Securities
theretofore validly tendered in accordance with the terms of the Registered
Exchange Offer) and (ii) will consummate the Registered Exchange Offer no later
than 40 days after the date on which the Exchange Offer Registration Statement
is declared effective (such 40th day, the "Consummation Deadline").

         Following the declaration of the effectiveness of the Exchange Offer
Registration Statement, the Company shall, as promptly as practicable, commence
the Registered Exchange Offer, it being the objective of such Registered
Exchange Offer to enable each Holder of Transfer Restricted Securities electing
to exchange the Initial Securities for Exchange Securities (assuming that such
Holder is not an affiliate of the Company within the meaning of the Securities
Act, acquires the Exchange Securities in the ordinary course of such Holder's
business and has no arrangements with any person to participate in the
distribution of the Exchange Securities and is not prohibited by any law or
policy of the Commission from participating in the Registered Exchange Offer) to
trade such Exchange Securities from and after their receipt without any
limitations or restrictions under the Securities Act and without material
restrictions under the securities laws of the several states of the United
States.

         The Company acknowledges that, pursuant to current interpretations by
the Commission's staff of Section 5 of the Securities Act, in the absence of an
applicable exemption therefrom, (i) each Holder that is a broker-dealer electing
to exchange Securities, acquired for its own account as a result of market
making activities or other trading activities, for Exchange Securities (an
"Exchanging Dealer"), is required to deliver a prospectus containing the
information set forth in (a) Annex A hereto on the cover, (b) Annex B hereto in
the "Exchange Offer Procedures" section and the "Purpose of the Exchange Offer"
section and (c) Annex C hereto in the "Plan of Distribution" section of such
prospectus in connection with a sale of any such Exchange Securities received by
such Exchanging Dealer pursuant to the Registered Exchange Offer and (ii) if the
Initial Purchaser elects to sell Exchange Securities acquired in exchange for
Initial Securities constituting any portion of its unsold allotment, it is
required to deliver a prospectus containing the information required by Items
507 or 508 of Regulation S-K under the Securities Act, as applicable, in
connection with such sale.

         The Company shall use its best efforts to keep the Exchange Offer
Registration Statement effective, and to amend and supplement the prospectus
contained therein, in order to permit such prospectus to be lawfully delivered
by all persons subject to the prospectus delivery requirements of the Securities
Act for such period of time as such persons must comply with such requirements
in order to resell the Exchange Securities; provided, however, that (i) in the
case where such prospectus and any amendment or supplement thereto must be
delivered by an Exchanging Dealer or the Initial Purchaser, such period shall be
the lesser of 180 days and the date on which all Exchanging Dealers and the
Initial Purchaser have sold all Exchange Securities held by them (unless such
period is extended pursuant to Section 3(j) below) and (ii) the Company shall
make such prospectus and any amendment or supplement thereto available to any
broker-dealer or other person with similar prospectus delivery requirements for
use in connection with any resale of any Exchange Securities for a period of not
less than 180 days after the effective date of the Exchange Offer Registration
Statement (or such shorter period during which such persons are required by

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applicable law to deliver such prospectus).

         If, upon consummation of the Registered Exchange Offer, the Initial
Purchaser holds Initial Securities acquired by it as part of its initial
distribution, the Company, simultaneously with the delivery of the Exchange
Securities pursuant to the Registered Exchange Offer, shall issue and deliver to
the Initial Purchaser upon the written request of the Initial Purchaser, in
exchange (the "Private Exchange") for the Initial Securities held by the Initial
Purchaser, a like principal amount of debt securities of the Company issued
under the Indenture and identical in all material respects (including the
existence of restrictions on transfer under the Securities Act and the
securities laws of the several states of the United States, but excluding
provisions relating to the matters described in Section 6 hereof) to the Initial
Securities (the "Private Exchange Securities"). The Initial Securities, the
Exchange Securities and the Private Exchange Securities are herein collectively
called the "Securities".

         In connection with the Registered Exchange Offer, the Company shall:

               (a) mail to each Holder a copy of the prospectus forming part of
          the Exchange Offer Registration Statement, together with an
          appropriate letter of transmittal and related documents;

               (b) keep the Registered Exchange Offer open for not less than 30
          days (or longer, if required by applicable law) after the date notice
          thereof is mailed to the Holders;

               (c) utilize the services of a depositary for the Registered
          Exchange Offer with an address in the Borough of Manhattan, The City
          of New York, or Baltimore, Maryland, which may be the Trustee or an
          affiliate of the Trustee;

               (d) permit Holders to withdraw tendered Securities at any time
          prior to the close of business, New York time, on the last business
          day on which the Registered Exchange Offer shall remain open; and

               (e) otherwise comply with all applicable laws.

         As soon as practicable after the close of the Registered Exchange Offer
or the Private Exchange, as the case may be, the Company shall:

               (x) accept for exchange all the Initial Securities validly
          tendered and not withdrawn pursuant to the Registered Exchange Offer
          and the Private Exchange;

               (y) deliver to the Trustee for cancellation all the Initial
          Securities so accepted for exchange; and

               (z) cause the Trustee to authenticate and deliver promptly to
          each Holder of the Initial Securities, Exchange Securities or Private
          Exchange Securities, as the case may be, equal in principal amount to
          the Initial Securities of such Holder so accepted for exchange.

         The Indenture will provide that (i) the Exchange Securities will not be
subject to the transfer restrictions set forth in the Indenture, (ii) all the
Securities will vote and consent together on all matters as one class and (iii)
that none of the Securities will have the right to vote or consent as a class
separate from one another on any matter.

         Interest on each Exchange Security and Private Exchange Security issued
pursuant to the Registered Exchange Offer and in the Private Exchange will
accrue from the last interest payment date on which interest was paid on the
Initial Securities surrendered in exchange therefor or, if no interest has been

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paid on the Initial Securities, from the date of original issue of the Initial
Securities.

         Each Holder participating in the Registered Exchange Offer shall be
required to represent to the Company that at the time of the consummation of the
Registered Exchange Offer (i) any Exchange Securities received by such Holder
will be acquired in the ordinary course of business, (ii) such Holder will have
no arrangements or understanding with any person to participate in the
distribution of the Securities or the Exchange Securities within the meaning of
the Securities Act, (iii) such Holder is not an "affiliate", as defined in Rule
405 of the Securities Act, of the Company or if it is an affiliate, such Holder
will comply with the registration and prospectus delivery requirements of the
Securities Act to the extent applicable, (iv) if such Holder is not a
broker-dealer, that it is not engaged in, and does not intend to engage in, the
distribution of the Exchange Securities and (v) if such Holder is a
broker-dealer, that it will receive Exchange Securities for its own account in
exchange for Initial Securities that were acquired as a result of market-making
activities or other trading activities and that it will be required to
acknowledge that it will deliver a prospectus in connection with any resale of
such Exchange Securities.

         Notwithstanding any other provisions hereof, the Company will ensure
that (i) any Exchange Offer Registration Statement and any amendment thereto and
any prospectus forming part thereof and any supplement thereto complies in all
material respects with the Securities Act and the rules and regulations
thereunder, (ii) any Exchange Offer Registration Statement and any amendment
thereto does not, when it becomes effective, contain an untrue statement of a
material fact or omit to state a material fact required to be stated therein or
necessary to make the statements therein not misleading and (iii) any prospectus
forming part of any Exchange Offer Registration Statement, and any supplement to
such prospectus, does not include an untrue statement of a material fact or omit
to state a material fact required to be stated therein or necessary in order to
make the statements therein, in the light of the circumstances under which they
were made, not misleading.

         2. Shelf Registration. If, (i) because of any change in law or in
applicable interpretations thereof by the staff of the Commission, the Company
is not permitted to effect a Registered Exchange Offer, as contemplated by
Section 1 hereof, (ii) the Registered Exchange Offer is not consummated within
180 days of the Issue Date, (iii) the Initial Purchaser so requests with respect
to the Initial Securities (or the Private Exchange Securities) not eligible to
be exchanged for Exchange Securities in the Registered Exchange Offer and held
by it following consummation of the Registered Exchange Offer or (iv) any Holder
(other than an Exchanging Dealer) is not eligible to participate in the
Registered Exchange Offer or, in the case of any Holder (other than an
Exchanging Dealer) that participates in the Registered Exchange Offer, such
Holder does not receive freely tradeable Exchange Securities on the date of the
exchange or may not resell the Exchange Securities acquired by it in the
Registered Exchange Offer to the public without delivering a prospectus, the
Company shall take the following actions (the date on which any of the
conditions described in the foregoing clauses (i) through (iv) occur, including
in the case of clauses (iii) or (iv) the receipt of the required notice, being a
"Trigger Date"):

               (a) The Company shall, at its cost, as promptly as practicable
          (but in no event more than 30 days after the Trigger Date (such 30th
          day being a "Filing Deadline")) (x) in the case of a Shelf
          Registration Statement filed pursuant to clause (i) of the foregoing
          paragraph, no later than 150 days after the Issue Date and (y) in the
          case of a Shelf Registration Statement filed pursuant to clause (ii),
          (iii) or (iv) of the foregoing paragraph, no later than 60 days after
          the applicable Filing Deadline (such 150th or 60th day, as the case
          may be, being an "Effectiveness Deadline"), file with the Commission

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          and thereafter shall use its reasonable best efforts to cause to be
          declared effective a registration statement (the "Shelf Registration
          Statement" and, together with the Exchange Offer Registration
          Statement, a "Registration Statement") on an appropriate form under
          the Securities Act relating to the offer and sale of the Transfer
          Restricted Securities by the Holders thereof from time to time in
          accordance with the methods of distribution set forth in the Shelf
          Registration Statement and Rule 415 under the Securities Act
          (hereinafter, the "Shelf Registration"); provided, however, that no
          Holder (other than the Initial Purchaser) shall be entitled to have
          the Securities held by it covered by such Shelf Registration Statement
          unless such Holder agrees in writing to be bound by all the provisions
          of this Agreement applicable to such Holder.

               (b) The Company shall use its best efforts to keep the Shelf
          Registration Statement continuously effective in order to permit the
          prospectus included therein to be lawfully delivered by the Holders of
          the relevant Securities, for a period of two years (or for such longer
          period if extended pursuant to Section 3(j) below) from the Issue Date
          or such shorter period that will terminate when all the Securities
          covered by the Shelf Registration Statement (i) have been sold
          pursuant thereto or (ii) can be sold pursuant to Rule 144 under the
          Securities Act without any limitations under clauses (c), (e), (f) or
          (h) thereof. The Company shall be deemed not to have used its best
          efforts to keep the Shelf Registration Statement effective during the
          requisite period if it voluntarily takes any action that would result
          in Holders of Securities covered thereby not being able to offer and
          sell such Securities during that period, unless such action is
          required by applicable law.

               (c) Notwithstanding any other provisions of this Agreement to the
          contrary, the Company shall cause the Shelf Registration Statement and
          the related prospectus and any amendment or supplement thereto, as of
          the effective date of the Shelf Registration Statement, amendment or
          supplement, (i) to comply in all material respects with the applicable
          requirements of the Securities Act and the rules and regulations of
          the Commission and (ii) not to contain any untrue statement of a
          material fact or omit to state a material fact required to be stated
          therein or necessary in order to make the statements therein, in light
          of the circumstances under which they were made, not misleading.

         3. Registration Procedures. In connection with any Shelf Registration
contemplated by Section 2 hereof and, to the extent applicable, any Registered
Exchange Offer contemplated by Section 1 hereof, the following provisions shall
apply:

               (a) The Company shall (i) furnish to the Initial Purchaser, prior
          to the filing thereof with the Commission, a copy of the Registration
          Statement and each amendment thereof and each supplement, if any, to
          the prospectus included therein and, in the event that the Initial
          Purchaser (with respect to any portion of an unsold allotment from the
          original offering) is participating in the Registered Exchange Offer
          or the Shelf Registration Statement, the Company shall use its
          reasonable best efforts to reflect in each such document, when so
          filed with the Commission, such comments as the Initial Purchaser
          reasonably may propose; (ii) include the information set forth in
          Annex A hereto on the cover, in Annex B hereto in the "Exchange Offer
          Procedures" section and the "Purpose of the Exchange Offer" section
          and in Annex C hereto in the "Plan of Distribution" section of the
          prospectus forming a part of the Exchange Offer Registration Statement
          and include the information set forth in Annex D hereto in the Letter
          of Transmittal delivered pursuant to the Registered Exchange Offer;
          (iii) if requested by the Initial Purchaser, include the information

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          required by Items 507 or 508 of Regulation S-K under the Securities
          Act, as applicable, in the prospectus forming a part of the Exchange
          Offer Registration Statement; (iv) include within the prospectus
          contained in the Exchange Offer Registration Statement a section
          entitled "Plan of Distribution", reasonably acceptable to the Initial
          Purchaser, which shall contain a summary statement of the positions
          taken or policies made by the staff of the Commission with respect to
          the potential "underwriter" status of any broker-dealer that is the
          beneficial owner (as defined in Rule 13d-3 under the Securities
          Exchange Act of 1934, as amended (the "Exchange Act")) of Exchange
          Securities received by such broker-dealer in the Registered Exchange
          Offer (a "Participating Broker-Dealer"), whether such positions or
          policies have been publicly disseminated by the staff of the
          Commission or such positions or policies, in the reasonable judgment
          of the Initial Purchaser based upon advice of counsel (which may be
          in-house counsel), represent the prevailing views of the staff of the
          Commission; and (v) in the case of a Shelf Registration Statement,
          include the names of the Holders, who propose to sell Securities
          pursuant to the Shelf Registration Statement, as selling security
          holders.

               (b) The Company shall give written notice to the Initial
          Purchaser, the Holders of the Securities and any Participating
          Broker-Dealer from whom the Company has received prior written notice
          that it will be a Participating Broker-Dealer in the Registered
          Exchange Offer (which notice pursuant to clauses (ii)-(v) hereof shall
          be accompanied by an instruction to suspend the use of the prospectus
          until the requisite changes have been made):

                    (i) when the Registration Statement or any amendment thereto
               has been filed with the Commission and when the Registration
               Statement or any post-effective amendment thereto has become
               effective;

                    (ii) of any request by the Commission for amendments or
               supplements to the Registration Statement or the prospectus
               included therein or for additional information;

                    (iii) of the issuance by the Commission of any stop order
               suspending the effectiveness of the Registration Statement or the
               initiation of any proceedings for that purpose;

                    (iv) of the receipt by the Company or its legal counsel of
               any notification with respect to the suspension of the
               qualification of the Securities for sale in any jurisdiction or
               the initiation or threatening of any proceeding for such purpose;
               and

                    (v) of the happening of any event that requires the Company
               to make changes in the Registration Statement or the prospectus
               in order that the Registration Statement or the prospectus do not
               contain an untrue statement of a material fact nor omit to state
               a material fact required to be stated therein or necessary to
               make the statements therein (in the case of the prospectus, in
               light of the circumstances under which they were made) not
               misleading.

               (c) The Company shall make every reasonable effort to obtain the
          withdrawal at the earliest possible time, of any order suspending the
          effectiveness of the Registration Statement.

               (d) The Company shall furnish to each Holder of Securities
          included within the coverage of the Shelf Registration, without

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          charge, at least one copy of the effective Shelf Registration
          Statement and any post-effective amendment thereto, including
          financial statements and schedules, and, if the Holder so requests in
          writing, all exhibits thereto (including those, if any, incorporated
          by reference).

               (e) The Company shall deliver to each Exchanging Dealer and the
          Initial Purchaser, and to any other Holder who so requests, without
          charge, at least one copy of the effective Exchange Offer Registration
          Statement and any post-effective amendment thereto, including
          financial statements and schedules, and, if the Initial Purchaser or
          any such Holder requests, all exhibits thereto (including those
          incorporated by reference).

               (f) The Company shall, during the Shelf Registration Period,
          deliver to each Holder of Securities included within the coverage of
          the Shelf Registration, without charge, as many copies of the
          prospectus (including each preliminary prospectus) included in the
          Shelf Registration Statement and any amendment or supplement thereto
          as such person may reasonably request. The Company consents, subject
          to the provisions of this Agreement, to the use of the prospectus or
          any amendment or supplement thereto by each of the selling Holders of
          the Securities in connection with the offering and sale of the
          Securities covered by the prospectus, or any amendment or supplement
          thereto, included in the Shelf Registration Statement.

               (g) The Company shall deliver to the Initial Purchaser, any
          Exchanging Dealer, any Participating Broker-Dealer and such other
          persons required to deliver a prospectus following the Registered
          Exchange Offer, without charge, as many copies of the final prospectus
          included in the Exchange Offer Registration Statement and any
          amendment or supplement thereto as such persons may reasonably
          request. The Company consents, subject to the provisions of this
          Agreement, to the use of the prospectus or any amendment or supplement
          thereto by the Initial Purchaser, if necessary, any Participating
          Broker-Dealer and such other persons required to deliver a prospectus
          following the Registered Exchange Offer in connection with the
          offering and sale of the Exchange Securities covered by the
          prospectus, or any amendment or supplement thereto, included in such
          Exchange Offer Registration Statement.

               (h) Prior to any public offering of the Securities, pursuant to
          any Registration Statement, the Company shall register or qualify or
          cooperate with the Holders of the Securities included therein and
          their respective counsel in connection with the registration or
          qualification of the Securities for offer and sale under the
          securities or "blue sky" laws of such states of the United States as
          any Holder of the Securities reasonably requests in writing and do any
          and all other acts or things necessary or advisable to enable the
          offer and sale in such jurisdictions of the Securities covered by such
          Registration Statement; provided, however, that the Company shall not
          be required to (i) qualify generally to do business in any
          jurisdiction where it is not then so qualified or (ii) take any action
          which would subject it to general service of process or to taxation in
          any jurisdiction where it is not then so subject.

               (i) The Company shall cooperate with the Holders of the
          Securities to facilitate the timely preparation and delivery of
          certificates representing the Securities to be sold pursuant to any
          Registration Statement free of any restrictive legends and in such
          denominations and registered in such names as the Holders may request
          a reasonable period of time prior to sales of the Securities pursuant
          to such Registration Statement.

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               (j) Upon the occurrence of any event contemplated by paragraphs
          (ii) through (v) of Section 3(b) above during the period for which the
          Company is required to maintain an effective Registration Statement,
          the Company shall promptly prepare and file a post-effective amendment
          to the Registration Statement or a supplement to the related
          prospectus and any other required document so that, as thereafter
          delivered to Holders of the Securities or purchasers of Securities,
          the prospectus will not contain an untrue statement of a material fact
          or omit to state any material fact required to be stated therein or
          necessary to make the statements therein, in light of the
          circumstances under which they were made, not misleading. If the
          Company notifies the Initial Purchaser, the Holders of the Securities
          and any known Participating Broker-Dealer in accordance with
          paragraphs (ii) through (v) of Section 3(b) above to suspend the use
          of the prospectus until the requisite changes to the prospectus have
          been made, then the Initial Purchaser, the Holders of the Securities
          and any such Participating Broker-Dealers shall suspend use of such
          prospectus, and the period of effectiveness of the Shelf Registration
          Statement provided for in Section 2(b) above and the Exchange Offer
          Registration Statement provided for in Section 1 above shall each be
          extended by the number of days from and including the date of the
          giving of such notice to and including the date when the Initial
          Purchaser, the Holders of the Securities and any known Participating
          Broker-Dealer shall have received such amended or supplemented
          prospectus pursuant to this Section 3(j).

               (k) Not later than the effective date of the applicable
          Registration Statement, the Company will provide a CUSIP number for
          the Initial Securities, the Exchange Securities or the Private
          Exchange Securities, as the case may be, and provide the applicable
          trustee with printed certificates for the Initial Securities, the
          Exchange Securities or the Private Exchange Securities, as the case
          may be, in a form eligible for deposit with The Depository Trust
          Company.

               (l) The Company will comply with all rules and regulations of the
          Commission to the extent and so long as they are applicable to the
          Registered Exchange Offer or the Shelf Registration and will make
          generally available to its security holders (or otherwise provide in
          accordance with Section 11(a) of the Securities Act) an earnings
          statement satisfying the provisions of Section 11(a) of the Securities
          Act, no later than 90 days after the end of a 12-month period (or 180
          days, if such period is a fiscal year) beginning with the first month
          of the Company's first fiscal quarter commencing after the effective
          date of the Registration Statement, which statement shall cover such
          12-month period.

               (m) The Company shall cause the Indenture to be qualified under
          the Trust Indenture Act of 1939, as amended (the "Trust Indenture
          Act"), in a timely manner and containing such changes, if any, as
          shall be necessary for such qualification. In the event that such
          qualification would require the appointment of a new trustee under the
          Indenture, the Company shall appoint a new trustee thereunder pursuant
          to the applicable provisions of the Indenture.

               (n) The Company may require each Holder of Securities to be sold
          pursuant to the Shelf Registration Statement to furnish to the Company
          such information regarding the Holder and the distribution of the
          Securities as the Company may from time to time reasonably require for
          inclusion in the Shelf Registration Statement, and the Company may
          exclude from such registration the Securities of any Holder that
          unreasonably fails to furnish such information within a reasonable

                                    Page 8
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          time after receiving such request.

               (o) The Company shall enter into such customary agreements
          (including, if requested, an underwriting agreement in customary form)
          and take all such other action, if any, as any Holder of the
          Securities shall reasonably request in order to facilitate the
          disposition of the Securities pursuant to any Shelf Registration.

               (p) In the case of any Shelf Registration, the Company shall (i)
          make reasonably available for inspection by a representative of the
          Holders of the Securities, any underwriter participating in any
          disposition pursuant to the Shelf Registration Statement and any
          attorney, accountant or other agent retained by the Holders of the
          Securities or any such underwriter all relevant financial and other
          records, pertinent corporate documents and properties of the Company
          and (ii) cause the Company's officers, directors, employees,
          accountants and auditors to supply all relevant information reasonably
          requested by the Holders of the Securities or any such underwriter,
          attorney, accountant or agent in connection with the Shelf
          Registration Statement, in each case, as shall be reasonably necessary
          to enable such persons, to conduct a reasonable investigation within
          the meaning of Section 11 of the Securities Act; provided, however,
          that the foregoing inspection and information gathering shall be
          coordinated by you and, on behalf of the other parties, by one counsel
          designated by and on behalf of such other parties as described in
          Section 4 hereof.

               (q) In the case of any Shelf Registration, the Company, if
          requested by a majority of the Holders of Securities covered thereby,
          shall cause (i) its counsel or counsels to deliver an opinion or
          opinions and updates thereof relating to the Securities in customary
          form addressed to such Holders and the managing underwriters, if any,
          thereof in form and substance reasonably satisfactory to such Holders
          and the managing underwriters and dated, in the case of the initial
          opinion or opinions, the effective date of such Shelf Registration
          Statement (it being agreed that the matters to be covered by such
          opinion or opinions shall include those matters customarily covered by
          opinions delivered in connection with a Shelf Registration); (ii) its
          officers to execute and deliver all customary documents and
          certificates and updates thereof reasonably requested by any
          underwriters of the applicable Securities and (iii) its independent
          public accountants and the independent public accountants with respect
          to any other entity for which financial information is provided in the
          Shelf Registration Statement to provide to the selling Holders of the
          applicable Securities and any underwriter therefor a comfort letter in
          customary form and covering matters of the type customarily covered in
          comfort letters in connection with primary underwritten offerings,
          subject to receipt of appropriate documentation as contemplated, and
          only if permitted, by Statement of Auditing Standards No. 72.

               (r) In the case of the Registered Exchange Offer, if requested by
          the Initial Purchaser or any known Participating Broker-Dealer, the
          Company shall, at the time of the consummation of such Registered
          Exchange Offer, cause (i) its counsels to deliver to the Initial
          Purchaser or such Participating Broker-Dealer signed opinions in the
          form set forth in Sections 6(c)(i) through (viii) of the Purchase
          Agreement with such changes as are customary in connection with the
          preparation of a Registration Statement and (ii) its independent
          public accountants and the independent public accountants with respect
          to any other entity for which financial information is provided in the
          Registration Statement to deliver to the Initial Purchaser or such
          Participating Broker-Dealer a comfort letter, in customary form,
          meeting the requirements as to the substance thereof as set forth in

                                    Page 9
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          Section 6(a) of the Purchase Agreement, with appropriate date changes.

               (s) If a Registered Exchange Offer or a Private Exchange is to be
          consummated, upon delivery of the Initial Securities by Holders to the
          Company (or to such other Person as directed by the Company) in
          exchange for the Exchange Securities or the Private Exchange
          Securities, as the case may be, the Company shall mark, or cause to be
          marked, on the Initial Securities so exchanged that such Initial
          Securities are being canceled in exchange for the Exchange Securities
          or the Private Exchange Securities, as the case may be; in no event
          shall the Initial Securities be marked as paid or otherwise satisfied.

               (t) The Company will use its best efforts to (i) if the Initial
          Securities have been rated prior to the initial sale of such Initial
          Securities, confirm such ratings will apply to the Securities covered
          by a Registration Statement, or (ii) if the Initial Securities were
          not previously rated, cause the Securities covered by a Registration
          Statement to be rated with the appropriate rating agencies, if so
          requested by Holders of at least a majority in aggregate principal
          amount of Securities covered by such Registration Statement, or by the
          managing underwriters, if any.

               (u) In the event that any broker-dealer registered under the
          Exchange Act shall underwrite any Securities or participate as a
          member of an underwriting syndicate or selling group or "assist in the
          distribution" (within the meaning of the Conduct Rules (the "Rules")
          of the National Association of Securities Dealers, Inc. ("NASD"))
          thereof, whether as a Holder of such Securities or as an underwriter,
          a placement or sales agent or a broker or dealer in respect thereof,
          or otherwise, the Company will assist such broker-dealer in complying
          with the requirements of such Rules, including, without limitation, by
          (i) if such Rules, including Rule 2720, shall so require, engaging a
          "qualified independent underwriter" (as defined in Rule 2720) to
          participate in the preparation of the Registration Statement relating
          to such Securities, to exercise usual standards of due diligence in
          respect thereto and, if any portion of the offering contemplated by
          such Registration Statement is an underwritten offering or is made
          through a placement or sales agent, to recommend the yield of such
          Securities, (ii) indemnifying any such qualified independent
          underwriter to the extent of the indemnification of underwriters
          provided in Section 5 hereof and (iii) providing such information to
          such broker-dealer as may be required in order for such broker-dealer
          to comply with the requirements of the Rules.

               (v) The Company shall use its best efforts to take all other
          steps necessary to effect the registration of the Securities covered
          by a Registration Statement contemplated hereby.

         4. Registration Expenses. The Company shall bear all fees and expenses
incurred in connection with the performance of its obligations under Sections 1
through 3 hereof, whether or not the Exchange Offer Registration Statement or a
Shelf Registration Statement is filed or becomes effective, and, in connection
with any Registration Statement, shall reimburse the Initial Purchaser and the
Holders (i) of the Securities being tendered in connection with the Registered
Exchange Offer and/or (ii) selling or reselling Securities in connection with a
Shelf Registration, for the reasonable fees and disbursements of one firm of
counsel, who shall be Cravath, Swaine & Moore LLP unless another firm shall be
chosen by the Holders of at least a majority in principal amount of the
Securities for whose benefit such Registration Statement is being prepared.

         5. Indemnification. (a) The Company agrees to indemnify and hold
harmless each Holder of the Securities, any Participating Broker-Dealer and each
person, if any, who is a director or officer of such Holder or such

                                    Page 10
<PAGE>

Participating Broker-Dealer or who controls such Holder or such Participating
Broker-Dealer within the meaning of the Securities Act or the Exchange Act (each
Holder, any Participating Broker-Dealer and such directors, officers and
controlling persons are referred to collectively as the "Indemnified Parties")
from and against any losses, claims, damages or liabilities, joint or several,
or any actions in respect thereof (including, but not limited to, any losses,
claims, damages, liabilities or actions relating to purchases and sales of the
Securities) to which each Indemnified Party may become subject under the
Securities Act, the Exchange Act or otherwise, insofar as such losses, claims,
damages, liabilities or actions arise out of or are based upon any untrue
statement or alleged untrue statement of a material fact contained in a
Registration Statement or prospectus or in any amendment or supplement thereto
or in any preliminary prospectus relating to a Shelf Registration, or arise out
of, or are based upon, the omission or alleged omission to state therein a
material fact required to be stated therein or necessary to make the statements
therein not misleading, and shall reimburse, as incurred, the Indemnified
Parties for any legal or other expenses reasonably incurred by them in
connection with investigating or defending any such loss, claim, damage,
liability or action in respect thereof; provided, however, that (i) the Company
shall not be liable in any such case to the extent that such loss, claim, damage
or liability arises out of or is based upon any untrue statement or alleged
untrue statement or omission or alleged omission made in a Registration
Statement or prospectus or in any amendment or supplement thereto or in any
preliminary prospectus relating to a Shelf Registration in reliance upon and in
conformity with written information pertaining to such Holder and furnished to
the Company by or on behalf of such Holder specifically for inclusion therein
and (ii) with respect to any untrue statement or omission or alleged untrue
statement or omission made in any preliminary prospectus relating to a Shelf
Registration Statement, the indemnity agreement contained in this subsection (a)
shall not inure to the benefit of any Holder or Participating Broker-Dealer from
whom the person asserting any such losses, claims, damages or liabilities
purchased the Securities concerned, to the extent that a prospectus relating to
such Securities was required to be delivered by such Holder or Participating
Broker-Dealer under the Securities Act in connection with such purchase and any
such loss, claim, damage or liability of such Holder or Participating
Broker-Dealer results from the fact that there was not sent or given to such
person, at or prior to the written confirmation of the sale of such Securities
to such person, a copy of the final prospectus if the Company had previously
furnished copies thereof to such Holder or Participating Broker-Dealer; provided
further, however, that this indemnity agreement will be in addition to any
liability which the Company may otherwise have to such Indemnified Party. The
Company shall also indemnify underwriters, their officers and directors and each
person who controls such underwriters within the meaning of the Securities Act
or the Exchange Act to the same extent as provided above with respect to the
indemnification of the Holders of the Securities if requested by such Holders.

         (b) Each Holder of the Securities, severally and not jointly, will
indemnify and hold harmless the Company, its directors and officers and each
person, if any, who controls the Company within the meaning of the Securities
Act or the Exchange Act from and against any losses, claims, damages or
liabilities or any actions in respect thereof, to which the Company or any such
controlling person may become subject under the Securities Act, the Exchange Act
or otherwise, insofar as such losses, claims, damages, liabilities or actions
arise out of or are based upon any untrue statement or alleged untrue statement
of a material fact contained in a Registration Statement or prospectus or in any
amendment or supplement thereto or in any preliminary prospectus relating to a
Shelf Registration, or arise out of or are based upon the omission or alleged
omission to state therein a material fact necessary to make the statements
therein not misleading, but in each case only to the extent that the untrue
statement or omission or alleged untrue statement or omission was made in
reliance upon and in conformity with written information pertaining to such
Holder and furnished to the Company by or on behalf of such Holder specifically
for inclusion therein; and, subject to the limitation set forth immediately

                                    Page 11
<PAGE>

preceding this clause, shall reimburse, as incurred, the Company for any legal
or other expenses reasonably incurred by the Company or any such controlling
person in connection with investigating or defending any loss, claim, damage,
liability or action in respect thereof. This indemnity agreement will be in
addition to any liability which such Holder may otherwise have to the Company or
any of its controlling persons.

         (c) Promptly after receipt by an indemnified party under this Section 5
of notice of the commencement of any action or proceeding (including a
governmental investigation), such indemnified party will, if a claim in respect
thereof is to be made against the indemnifying party under this Section 5,
notify the indemnifying party of the commencement thereof; but the failure to
notify the indemnifying party shall not relieve the indemnifying party from any
liability that it may have under subsection (a) or (b) above except to the
extent that it has been materially prejudiced (through the forfeiture of
substantive rights or defenses) by such failure; and provided further that the
failure to notify the indemnifying party shall not relieve it from any liability
that it may have to an indemnified party otherwise than under subsection (a) or
(b) above. In case any such action is brought against any indemnified party, and
it notifies the indemnifying party of the commencement thereof, the indemnifying
party will be entitled to participate therein and, to the extent that it may
wish, jointly with any other indemnifying party similarly notified, to assume
the defense thereof, with counsel reasonably satisfactory to such indemnified
party (who shall not, except with the consent of the indemnified party, be
counsel to the indemnifying party), and after notice from the indemnifying party
to such indemnified party of its election so to assume the defense thereof the
indemnifying party will not be liable to such indemnified party under this
Section 5 for any legal or other expenses, other than reasonable costs of
investigation, subsequently incurred by such indemnified party in connection
with the defense thereof. No indemnifying party shall, without the prior written
consent of the indemnified party, effect any settlement of any pending or
threatened action in respect of which any indemnified party is or could have
been a party and indemnity could have been sought hereunder by such indemnified
party unless such settlement (i) includes an unconditional release of such
indemnified party from all liability on any claims that are the subject matter
of such action, and (ii) does not include a statement as to or an admission of
fault, culpability or a failure to act by or on behalf of any indemnified party.

         (d) If the indemnification provided for in this Section 5 is
unavailable or insufficient to hold harmless an indemnified party under
subsections (a) or (b) above, then each indemnifying party shall contribute to
the amount paid or payable by such indemnified party as a result of the losses,
claims, damages or liabilities (or actions in respect thereof) referred to in
subsection (a) or (b) above (i) in such proportion as is appropriate to reflect
the relative benefits received by the indemnifying party or parties on the one
hand and the indemnified party on the other from the exchange of the Securities,
pursuant to the Registered Exchange Offer, or (ii) if the allocation provided by
the foregoing clause (i) is not permitted by applicable law, in such proportion
as is appropriate to reflect not only the relative benefits referred to in
clause (i) above but also the relative fault of the indemnifying party or
parties on the one hand and the indemnified party on the other in connection
with the statements or omissions that resulted in such losses, claims, damages
or liabilities (or actions in respect thereof) as well as any other relevant
equitable considerations. The relative fault of the parties shall be determined
by reference to, among other things, whether the untrue or alleged untrue
statement of a material fact or the omission or alleged omission to state a
material fact relates to information supplied by the Company on the one hand or
such Holder or such other indemnified party, as the case may be, on the other,
and the parties' relative intent, knowledge, access to information and
opportunity to correct or prevent such statement or omission. The amount paid by
an indemnified party as a result of the losses, claims, damages or liabilities
referred to in the first sentence of this subsection (d) shall be deemed to
include any legal or other expenses reasonably incurred by such indemnified

                                    Page 12
<PAGE>

party in connection with investigating or defending any action or claim which is
the subject of this subsection (d). Notwithstanding any other provision of this
Section 5(d), the Holders of the Securities shall not be required to contribute
any amount in excess of the amount by which the net proceeds received by such
Holders from the sale of the Securities pursuant to a Registration Statement
exceeds the amount of damages which such Holders have otherwise been required to
pay by reason of such untrue or alleged untrue statement or omission or alleged
omission. No person guilty of fraudulent misrepresentation (within the meaning
of Section 11(f) of the Securities Act) shall be entitled to contribution from
any person who was not guilty of such fraudulent misrepresentation. For purposes
of this subsection (d), each person, if any, who controls such indemnified party
within the meaning of the Securities Act or the Exchange Act shall have the same
rights to contribution as such indemnified party and each person, if any, who
controls the Company within the meaning of the Securities Act or the Exchange
Act shall have the same rights to contribution as the Company.

         (e) The agreements contained in this Section 5 shall survive the sale
of the Securities pursuant to a Registration Statement and shall remain in full
force and effect, regardless of any termination or cancellation of this
Agreement or any investigation made by or on behalf of any indemnified party.

         6. Additional Interest Under Certain Circumstances. (a) Additional
interest (the "Additional Interest") with respect to the Securities shall be
assessed as follows if any of the following events occur (each such event in
clauses (i) through (iv) below a "Registration Default"):

               (i) any Registration Statement required by this Agreement is not
          filed with the Commission on or prior to the applicable Filing
          Deadline;

               (ii) any Registration Statement required by this Agreement is not
          declared effective by the Commission on or prior to the applicable
          Effectiveness Deadline;

               (iii) the Registered Exchange Offer has not been consummated on
          or prior to the Consummation Deadline; or

               (iv) any Registration Statement required by this Agreement has
          been declared effective by the Commission, but (A) such Registration
          Statement thereafter ceases to be effective, or (B) such Registration
          Statement or the related prospectus ceases to be usable in connection
          with resales of Transfer Restricted Securities during the periods
          specified herein because either (1) any event occurs as a result of
          which the related prospectus forming part of such Registration
          Statement would include any untrue statement of a material fact or
          omit to state any material fact necessary to make the statements
          therein in the light of the circumstances under which they were made
          not misleading, or (2) it shall be necessary to amend such
          Registration Statement or supplement the related prospectus, to comply
          with the Securities Act or the Exchange Act or the respective rules
          thereunder.

Each of the foregoing will constitute a Registration Default whatever the reason
for any such event and whether it is voluntary or involuntary or is beyond the
control of the Company or pursuant to operation of law or as a result of any
action or inaction by the Commission.

         Additional Interest shall accrue on the Securities over and above the
interest set forth in the title of the Securities from and including the date on
which any such Registration Default shall occur to but excluding the date on
which all such Registration Defaults have been cured, at a rate of 1.00% per
annum (the "Additional Interest Rate"); provided, however, that if a
Registration Default shall occur and be continuing on the date that is two years

                                    Page 13
<PAGE>

following the Issue Date, such additional interest at the rate of 1.00% per
annum will accrue permanently on the Securities.

         (b) A Registration Default referred to in Section 6(a)(iv)(B) hereof
shall be deemed not to have occurred and be continuing in relation to a Shelf
Registration Statement or the related prospectus if (i) such Registration
Default has occurred solely as a result of (x) the filing of a post-effective
amendment to such Shelf Registration Statement to incorporate annual audited
financial information with respect to the Company where such post-effective
amendment is not yet effective and needs to be declared effective to permit
Holders to use the related prospectus or (y) other material events, with respect
to the Company that would need to be described in such Shelf Registration
Statement or the related prospectus and (ii) in the case of clause (y), the
Company is proceeding promptly and in good faith to amend or supplement such
Shelf Registration Statement and related prospectus to describe such events;
provided, however, that in any case if such Registration Default occurs for a
continuous period in excess of 45 days, Additional Interest shall be payable in
accordance with the above paragraph from the day such Registration Default
occurs until such Registration Default is cured.

         (c) Any amounts of Additional Interest due pursuant to Section 6(a)
above will be payable in cash on the regular interest payment dates with respect
to the Initial Securities. The amount of Additional Interest will be determined
by multiplying the applicable Additional Interest Rate by the principal amount
of the Initial Securities, and further multiplied by a fraction, the numerator
of which is the number of days such Additional Interest Rate was applicable
during such period (determined on the basis of a 360-day year comprised of
twelve 30-day months), and the denominator of which is 360.

         (d) "Transfer Restricted Securities" means each Security until (i) the
date on which such Security has been exchanged by a person other than a
broker-dealer for a freely transferable Exchange Security in the Registered
Exchange Offer, (ii) following the exchange by a broker-dealer in the Registered
Exchange Offer of an Initial Security for an Exchange Security, the date on
which such Exchange Security is sold to a purchaser who receives from such
broker-dealer on or prior to the date of such sale a copy of the prospectus
contained in the Exchange Offer Registration Statement, (iii) the date on which
such Security has been effectively registered under the Securities Act and
disposed of in accordance with a Shelf Registration Statement or (iv) the date
on which such Security is distributed to the public pursuant to Rule 144 under
the Securities Act or is saleable pursuant to Rule 144(k) under the Securities
Act.

         7. Rules 144 and 144A. The Company shall use its best efforts to file
the reports required to be filed by it under the Securities Act and the Exchange
Act in a timely manner and, if at any time the Company is not required to file
such reports, it will, upon the request of any Holder of Securities, make
publicly available other information so long as necessary to permit sales of its
securities pursuant to Rules 144 and 144A. The Company covenants that it will
take such further action as any Holder of Securities may reasonably request, all
to the extent required from time to time to enable such Holder to sell
Securities without registration under the Securities Act within the limitation
of the exemptions provided by Rules 144 and 144A (including the requirements of
Rule 144A(d)(4)). The Company will provide a copy of this Agreement to
prospective purchasers of Initial Securities identified to the Company by the
Initial Purchaser upon request. Upon the request of any Holder of Initial
Securities, the Company shall deliver to such Holder a written statement as to
whether it has complied with such requirements. Notwithstanding the foregoing,
nothing in this Section 7 shall be deemed to require the Company to register any
of its securities pursuant to the Exchange Act.

         8. Underwritten Registrations. If any of the Transfer Restricted
Securities covered by any Shelf Registration are to be sold in an underwritten

                                    Page 14
<PAGE>

offering, the investment banker or investment bankers and manager or managers
that will administer the offering ("Managing Underwriters") will be selected by
the Holders of at least a majority in aggregate principal amount of such
Transfer Restricted Securities to be included in such offering, provided that
such selection is reasonably satisfactory to the Company.

         No person may participate in any underwritten registration hereunder
unless such person (i) agrees to sell such person's Transfer Restricted
Securities on the basis reasonably provided in any underwriting arrangements
approved by the persons entitled hereunder to approve such arrangements and (ii)
completes and executes all questionnaires, powers of attorney, indemnities,
underwriting agreements and other documents reasonably required under the terms
of such underwriting arrangements.

         9.  Miscellaneous.

         (a) Amendments and Waivers. The provisions of this Agreement may not be
amended, modified or supplemented, and waivers or consents to departures from
the provisions hereof may not be given, except by the Company and the written
consent of the Holders of at least a majority in principal amount of the
Securities affected by such amendment, modification, supplement, waiver or
consents. Without the consent of the Holder of each Security adversely effected,
however, no change may be made to the provisions relating to the payment of
Additional Interest.

         (b) Notices. All notices and other communications provided for or
permitted hereunder shall be made in writing by hand delivery, first-class mail,
facsimile transmission, or air courier which guarantees overnight delivery:

         (1) if to a Holder of the Securities, at the most current address given
by such Holder to the Company.

         (2) if to the Initial Purchaser;

                           Credit Suisse First Boston LLC
                           Eleven Madison Avenue
                           New York, NY 10010-3629
                           Fax No.:  (212) 325-8278
                           Attention:  Transactions Advisory Group

         with a copy to:

                           Cravath, Swaine & Moore LLP
                           Worldwide Plaza
                           825 Eighth Avenue
                           New York, NY 10019-7475
                           Fax No.:  (212) 474-3700
                           Attention:  William J. Whelan, III

         (3) if to the Company, at its address as follows:

                           Ultrapetrol (Bahamas) Limited
                           H & J Corporate Services Ltd.
                           Shirlaw House
                           87 Shirley Street
                           P. O. Box SS-19084
                           Nassau, Bahamas
                           Facsimile:  (242) 320 6919
                           Attention:  Felipe Menendez Ross

         with a copy to:

                           Ultrapetrol S.A.

                                    Page 15
<PAGE>

                           Leandro N. Alem 986 - 11th floor (C1001AAR)
                           Buenos Aires - Argentina
                           Facsimile:  (5411) 4315-0468
                           Attention:  Felipe Menendez Ross

         with a copy to:

                           Seward & Kissel LLP
                           One Battery Park Plaza
                           New York, NY 10004
                           Facsimile:  212-480-8421
                           Attention:  Lawrence Rutkowski

         All such notices and communications shall be deemed to have been duly
given: at the time delivered by hand, if personally delivered; five business
days after being deposited in the mail, postage prepaid, if mailed; when receipt
is acknowledged by recipient's facsimile machine operator, if sent by facsimile
transmission; and on the day delivered, if sent by overnight air courier
guaranteeing next day delivery.

         (c) No Inconsistent Agreements. The Company has not, as of the date
hereof, entered into, nor shall it, on or after the date hereof, enter into, any
agreement with respect to its securities that is inconsistent with the rights
granted to the Holders herein or otherwise conflicts with the provisions hereof.

         (d) Successors and Assigns. This Agreement shall be binding upon the
Company and its successors and assigns.

         (e) Counterparts. This Agreement may be executed in any number of
counterparts and by the parties hereto in separate counterparts, each of which
when so executed shall be deemed to be an original and all of which taken
together shall constitute one and the same agreement.

         (f) Headings. The headings in this Agreement are for convenience of
reference only and shall not limit or otherwise affect the meaning hereof.

         (g) Governing Law. THIS AGREEMENT SHALL BE GOVERNED BY, AND CONSTRUED
IN ACCORDANCE WITH, THE LAWS OF THE STATE OF NEW YORK WITHOUT REGARD TO
PRINCIPLES OF CONFLICTS OF LAWS.

         (h) Severability. If any one or more of the provisions contained
herein, or the application thereof in any circumstance, is held invalid, illegal
or unenforceable, the validity, legality and enforceability of any such
provision in every other respect and of the remaining provisions contained
herein shall not be affected or impaired thereby.

         (i) Securities Held by the Company. Whenever the consent or approval of
Holders of a specified percentage of principal amount of Securities is required
hereunder, Securities held by the Company or its affiliates (other than
subsequent Holders of Securities if such subsequent Holders are deemed to be
affiliates solely by reason of their holdings of such Securities) shall not be
counted in determining whether such consent or approval was given by the Holders
of such required percentage.

         (j) Third Party Beneficiaries. The Holders shall be third party
beneficiaries to the agreements made hereunder between the Company, on the one
hand, and the Initial Purchaser, on the other hand, and shall have the right to
enforce such agreements directly to the extent they may deem such enforcement
necessary or advisable to protect their rights or the rights of Holders
hereunder.

         (k) Agent for Service; Submission to Jurisdiction; Waiver of
Immunities. By the execution and delivery of this Agreement, the Company (i)

acknowledges that it has, by separate written instrument, irrevocably designated
and appointed CT Corporation System, 111 Eighth Avenue, New York, New York 10011
(and any successor entity), as its authorized agent upon which process may be
served in any suit or proceeding arising out of or relating to this Agreement
that may be instituted in any Federal or state court in the State of New York or
brought under Federal or state securities laws, and acknowledges that CT
Corporation System has accepted such designation, (ii) submits to the
nonexclusive jurisdiction of any such court in any such suit or proceeding, and
(iii) agrees that service of process upon CT Corporation System and written
notice of said service to the Company shall be deemed in every respect effective
service of process upon it in any such suit or proceeding. The Company further
agrees to take any and all action, including the execution and filing of any and
all such documents and instruments, as may be necessary to continue such
designation and appointment of CT Corporation System in full force and effect so
long as any of the Securities shall be outstanding. To the extent that the
Company may acquire any immunity from jurisdiction of any court or from any
legal process (whether through service of notice, attachment prior to judgment,
attachment in aid of execution, execution or otherwise) with respect to itself
or its property, it hereby irrevocably waives such immunity in respect of this
Agreement, to the fullest extent permitted by law.

                                    Page 16
<PAGE>

         If the foregoing is in accordance with your understanding of our
agreement, please sign and return to the Company a counterpart hereof, whereupon
this instrument, along with all counterparts, will become a binding agreement
among the Initial Purchaser and the Company in accordance with its terms.

                                       Very truly yours,

                                       ULTRAPETROL (BAHAMAS) LIMITED

                                       By :  /s/ Leonard J. Hoskinson
                                             ----------------------------
                                            Name:  Leonard J. Hoskinson
                                            Title: Attorney-in-Fact

                                       BAYHAM INVESTMENTS S.A.
                                       BALDWIN MARITIME INC.
                                       CAVALIER SHIPPING INC.
                                       CORPORACION DE NAVEGACION MUNDIAL S.A.
                                       DANUBE MARITIME INC.
                                       GENERAL VENTURES INC.
                                       IMPERIAL MARITIME LTD. (BAHAMAS) INC.
                                       KATTEGAT SHIPPING INC.
                                       KINGLY SHIPPING LTD.
                                       MAJESTIC MARITIME LTD.
                                       MASSENA PORT S.A.
                                       MONARCH SHIPPING LTD.
                                       NOBLE SHIPPING LTD.
                                       OCEANPAR S.A.
                                       OCEANVIEW MARITIME INC.
                                       PARFINA S.A.
                                       PARKWOOD COMMERCIAL CORP.
                                       PRINCELY INTERNATIONAL FINANCE CORP.
                                       REGAL INTERNATIONAL INVESTMENTS S.A.
                                       RIVERVIEW COMMERCIAL CORP.
                                       SOVEREIGN MARITIME LTD.
                                       STANMORE SHIPPING INC.
                                       TIPTON MARINE INC.
                                       ULTRAPETROL INTERNATIONAL S.A.
                                       ULTRAPETROL S.A.
                                       UP OFFSHORE (HOLDINGS) LTD.

                                       each as a Guarantor,

                                       By : /s/ Leonard J. Hoskinson
                                            ------------------------------
                                            Name:  Leonard J. Hoskinson
                                            Title: Attorney-in-Fact

                                       MARITIMA SIPSA S.A.
                                       RIVERPAR S.A.
                                       UABL S.A.,

                                       each as a Pledgor,

                                       By : /s/ Leonard J. Hoskinson
                                            ------------------------------
                                            Name:  Leonard J. Hoskinson
                                            Title: Attorney-in-Fact

                                    Page 17
<PAGE>

The foregoing Registration Rights
Agreement is hereby and accepted as
of the date first above written.

By CREDIT SUISSE FIRST BOSTON LLC

By :  /s/ Adam Inselbuch
      -------------------------
     Name:  Adam Inselbuch
     Title: Managing Director

                                    Page 18
<PAGE>

                                                                ANNEX A

         Each broker-dealer that receives Exchange Securities for its own
account pursuant to the Exchange Offer must acknowledge that it will deliver a
prospectus in connection with any resale of such Exchange Securities. The Letter
of Transmittal states that by so acknowledging and by delivering a prospectus, a
broker-dealer will not be deemed to admit that it is an "underwriter" within the
meaning of the Securities Act. This Prospectus, as it may be amended or
supplemented from time to time, may be used by a broker-dealer in connection
with resales of Exchange Securities received in exchange for Initial Securities
where such Initial Securities were acquired by such broker-dealer as a result of
market-making activities or other trading activities. The Company has agreed
that, for a period of 180 days after the Expiration Date (as defined herein), it
will make this Prospectus available to any broker-dealer for use in connection
with any such resale. See "Plan of Distribution."

                                    Page 19
<PAGE>

                                                                   ANNEX B

         Each broker-dealer that receives Exchange Securities for its own
account in exchange for Initial Securities, where such Initial Securities were
acquired by such broker-dealer as a result of market-making activities or other
trading activities, must acknowledge that it will deliver a prospectus in
connection with any resale of such Exchange Securities. See "Plan of
Distribution."

                                    Page 20
<PAGE>

                                                                   ANNEX C

                              PLAN OF DISTRIBUTION

         Each broker-dealer that receives Exchange Securities for its own
account pursuant to the Exchange Offer must acknowledge that it will deliver a
prospectus in connection with any resale of such Exchange Securities. This
Prospectus, as it may be amended or supplemented from time to time, may be used
by a broker-dealer in connection with resales of Exchange Securities received in
exchange for Initial Securities where such Initial Securities were acquired as a
result of market-making activities or other trading activities. The Company has
agreed that, for a period of 180 days after the Expiration Date, it will make
this prospectus, as amended or supplemented, available to any broker-dealer for
use in connection with any such resale. In addition, until , 200 , all dealers
effecting transactions in the Exchange Securities may be required to deliver a
prospectus.(1)

----------------------
(1) In addition, the legend required by Item 502(e) of Regulation S-K
will appear on the back cover page of the Exchange Offer prospectus.

         The Company will not receive any proceeds from any sale of Exchange
Securities by broker-dealers. Exchange Securities received by broker-dealers for
their own account pursuant to the Exchange Offer may be sold from time to time
in one or more transactions in the over-the-counter market, in negotiated
transactions, through the writing of options on the Exchange Securities or a
combination of such methods of resale, at market prices prevailing at the time
of resale, at prices related to such prevailing market prices or negotiated
prices. Any such resale may be made directly to purchasers or to or through
brokers or dealers who may receive compensation in the form of commissions or
concessions from any such broker-dealer or the purchasers of any such Exchange
Securities. Any broker-dealer that resells Exchange Securities that were
received by it for its own account pursuant to the Exchange Offer and any broker
or dealer that participates in a distribution of such Exchange Securities may be
deemed to be an "underwriter" within the meaning of the Securities Act and any
profit on any such resale of Exchange Securities and any commission or
concessions received by any such persons may be deemed to be underwriting
compensation under the Securities Act. The Letter of Transmittal states that, by
acknowledging that it will deliver and by delivering a prospectus, a
broker-dealer will not be deemed to admit that it is an "underwriter" within the
meaning of the Securities Act.

         For a period of 180 days after the Expiration Date the Company will
promptly send additional copies of this Prospectus and any amendment or
supplement to this Prospectus to any broker-dealer that requests such documents
in the Letter of Transmittal. The Company has agreed to pay all expenses
incident to the Exchange Offer (including the expenses of one counsel for the
Holders of the Securities) other than commissions or concessions of any brokers
or dealers and will indemnify the Holders of the Securities (including any
broker-dealers) against certain liabilities, including liabilities under the
Securities Act.

                                    Page 21
<PAGE>

                                                                    ANNEX D

|  | CHECK HERE IF YOU ARE A BROKER-DEALER AND WISH TO RECEIVE 10 ADDITIONAL
COPIES OF THE PROSPECTUS AND 10 COPIES OF ANY AMENDMENTS OR SUPPLEMENTS THERETO.

                  Name:  ____________________________________________

                  Address: ___________________________________________
                           ___________________________________________

If the undersigned is not a broker-dealer, the undersigned represents that it is
not engaged in, and does not intend to engage in, a distribution of Exchange
Securities. If the undersigned is a broker-dealer that will receive Exchange
Securities for its own account in exchange for Initial Securities that were
acquired as a result of market-making activities or other trading activities, it
acknowledges that it will deliver a prospectus in connection with any resale of
such Exchange Securities; however, by so acknowledging and by delivering a
prospectus, the undersigned will not be deemed to admit that it is an
"underwriter" within the meaning of the Securities Act.

                                    Page 22
<PAGE>

                                   SCHEDULE A

                                   GUARANTORS

Subsidiary                                        Country of Organization
----------                                        -----------------------

Bayham Investments S.A.                           Panama
Baldwin Maritime Inc.                             Panama
Cavalier Shipping Inc.                            Panama
Corporacion de Navegacion Mundial S.A.            Chile
Danube Maritime Inc.                              Panama
General Ventures Inc.                             Liberia
Imperial Maritime Ltd. (Bahamas) Inc.             Panama
Kattegat Shipping Inc.                            Panama
Kingly Shipping Ltd.                              Bahamas
Majestic Maritime Ltd.                            Bahamas
Massena Port S.A.                                 Uruguay
Monarch Shipping Ltd.                             Bahamas
Noble Shipping Ltd.                               Bahamas
Oceanpar S.A.                                     Paraguay
Oceanview Maritime Inc.                           Panama
Parfina S.A.                                      Paraguay
Parkwood Commercial Corp.                         Panama
Princely International Finance Corp.              Panama
Regal International Investments S.A.              Panama
Riverview Commercial Corp.                        Panama
Sovereign Maritime Ltd.                           Bahamas
Stanmore Shipping Inc.                            Panama
Tipton Marine Inc.                                Panama
Ultrapetrol International S.A.                    Panama
Ultrapetrol S.A.                                  Argentina
UP Offshore (Holdings) Ltd.                       Bahamas

                                    Page 23