system: You are a legal assistant. Answer concisely and accurately. When legal text is provided, rely on it and do not invent facts.

user: Read the following U.S. Supreme Court case excerpt and classify it into the correct legal issue area. Excerpt: 507 U.S. 7 113 S.Ct. 1238 122 L.Ed.2d 381 UNITED STATES of America, plaintiff,v.STATE OF LOUISIANA, et al. (Alabama and Mississippi Boundary Case). No. 9, Original. Supreme Court of the United States February 22, 1993 1 Joint motion of the United States and Alabama for entry of supplemental decree is granted. Supplemental decree to implement decree of November 5, 1990 filed. Parties shall bear their own costs of these proceedings. Court retains jurisdiction to enter orders and issue such writs as may be deemed necessary. ON BILL OF COMPLAINT SUPPLEMENTAL DECREE 2 By its decision of February 26, 1985, the Court overruled the exceptions of the United States to the Report of its Special Master insofar as it challenged the Master's determination that the whole of Mississippi Sound constitutes historic inland waters, and, to this extent, adopted the Master's recommendations and confirmed his Report. 3 On march 1, 1988, the Court resolved the disagreement between the United States and Mississippi as to that portion of the Mississippi coastline at issue in the above-captioned litigation and directed parties to submit to the Special Master a proposed appropriate decree defining the claims of Alabama and Mississippi with respect to Mississippi Sound. On August 17, 1990, the parties agreed on and submitted to the Special Master a proposed decree in accordance with the Court's decision of March 1, 1988, which was approved by the Court on November 5, 1990. Pursuant to that Supplemental Decree, the baseline (coastline) of the State of Mississippi as well as a portion of the baseline of the State of Alabama was delimited and, by stipulation of the parties, fixed, as described by coordinates in that decree. That portion of the Alabama coastline not described by coordinates in the decree remained ambulatory. 4 Thereafter, a dispute arose between the State of Alabama and the United States regarding their respective claims under the Submerged Lands Act, 43 U.S.C. 1301 et seq., to offshore areas in which the baseline had not been fixed by the Court's November 5, 1990 Decree. The parties thereafter filed a joint motion with this Court, requesting that the Court invoke its continuing jurisdiction to supplement the November 5, 1990, Decree. 498 U.S. 9, 111 S.Ct. 377, 112 L.Ed.2d 269 (1990). With that motion the parties submitted for the Court's consideration a supplemental decree which would fix that portion of the Alabama baseline that had heretofore remained ambulatory, resolve the existing dispute, and avoid future jurisdictional controversies over the State of Alabama Submerged Lands Act grant. 5 Accordingly, 6 IT IS ORDERED, ADJUDGED AND DECREED as follows: 7 1. The parties' joint motion to supplement the Court's Decree of November 5, 1990 is granted. 8 2. For the purpose of the Court's Decree herein dated December 12, 1960, 364 U.S. 502 (defining the boundary line between the submerged lands of the States bordering the Gulf of Mexico), the coastline of the States of Alabama and Mississippi shall be determined on the basis that the whole Mississippi Sound constitutes state inland waters; 9 3. For the purposes of the said Decree of December 12, 1960, the coastline of Alabama includes: 10 (a) That portion of a straight line from a point on the eastern tip of Petit Bois Island where X = 215985 and Y = 77920 in the Alabama plane coordinate system, west zone, and X = 637152.89 and Y = 198279.25 in the Mississippi plane coordinate system, east zone, to a fixed point previously described as the western tip of Dauphin Island by the Court's Decree of November 5, 1990, where X = 238690 and Y = 84050 in the Alabama plane coordinate system, west zone, and X = 659783.79 and Y = 204674.56 in the Mississippi plane coordinate system, east zone, lying on the Alabama side of the Alabama-Mississippi boundary; 11 (b) A straight line from the fixed point previously described as the western tip of Dauphin Island where X = 238690 and Y = 84050 in the Alabama plane coordinate system, west zone, to a point on the western tip Dauphin Island where X = 240239.49 and Y = 85266.90 in the same coordinate system; 12 (c) The baseline delimiting Dauphin Island determined by the following points in the Alabama plane coordinate system, west zone: 13 E. COORD. N. COORD. 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99082.41 THROUGH 480366.90 99041.75 THROUGH 480893.00 99001.06 THROUGH 481199.70 98606.93 THROUGH 481322.14 97990.65 THROUGH 481479.95 97929.96 THROUGH 481970.97 97838.79 THROUGH 482269.23 98070.98 THROUGH 482400.89 98333.57 THROUGH 482646.54 98585.99 THROUGH 482909.74 98868.72 THROUGH 483111.46 98959.54 THROUGH 483435.89 98918.98 THROUGH 483953.36 99191.50 THROUGH 484391.89 99403.44 THROUGH 485058.36 99544.58 THROUGH 485488.00 99504.00 THROUGH 485716.07 99705.94 THROUGH 486058.04 99715.91 THROUGH 486408.84 99867.30 THROUGH 486908.66 99917.63 THROUGH 487320.85 100109.42 THROUGH 487820.68 100200.16 THROUGH 488469.63 100452.49 THROUGH 488934.38 100543.26 THROUGH 489407.93 100775.46 THROUGH 489898.99 100906.64 THROUGH 490293.63 101159.08 THROUGH 491003.88 101249.81 THROUGH 491547.53 101370.90 THROUGH 492029.80 101481.91 THROUGH 492617.29 101613.11 THROUGH 493160.94 101734.22 THROUGH 493748.41 101825.03 TO 494142.98 101915.88 14 4. The baseline described in Paragraph 3 above shall be fixed as of the date of this decree for the purposes of determining the Submerged Lands Act grant to the State of Alabama and shall from that no longer be ambulatory. 15 5. The parties shall bear their own costs of these proceedings. 16 6. The Court retains jurisdiction to entertain such further proceedings, enter such orders, and issue such writs as from time to time may be deemed necessary or advisable to effectuate and supplement the decree and the rights of the respective parties.

assistant: 11