Question: Christian O'Brien was involved in the discovery of Chogha Zanbil; which is one of the few ziggurats outside of where?

Context paragraphs:
Chris Brien: Christian John Brien is a drummer, percussionist and drum clinician.  From 1992 he was a member of Australian rock, funk and disco band, Swoop and appears on all three of their studio albums, "Thriller" (October 1993), "Woxo Principle" (November 1995), and "Be What You Is" (January 1999).  Their most popular single, "Apple Eyes", was released in 1995, which reached No. 9 on the ARIA Singles Chart.  At the ARIA Music Awards of 1994 Swoop were nominated for 'Best New Talent' for "Thriller"; at the 1996 awards they were nominated for 'Song of the Year' and 'Best Video' for "Apple Eyes", and for 'Best Pop Release' for "Woxo Principle".  Late in 1999 Swoop disbanded, Brien became a session musician and drum clinician, and has released solo material.  He has released a number of instructional DVDs including "Independence" (2002) and "Independence, Part 2" (2004).  In November 2006 he relocated to Hong Kong, where he issued his instructional book, "The Chris Brien Drumming System (Level One)", in late 2010.

Christianity in the 17th century: Missionary activity in Asia and the Americas grew strongly, put down roots, and developed its institutions, though it met with strong resistance in Japan in particular.  At the same time Christian colonization of some areas outside Europe succeeded, driven by economic as well as religious reasons.  Christian traders were heavily involved in the Atlantic slave trade, which had the effect of transporting Africans into Christian communities.  A land war between Christianity and Islam continued, in the form of the campaigns of the Habsburg Empire and Ottoman Empire in the Balkans, a turning point coming at Vienna in 1683.  The Tsardom of Russia, where Orthodox Christianity was the established religion, expanded eastwards into Siberia and Central Asia, regions of Islamic and shamanistic beliefs, and also southwest into the Ukraine, where the Uniate Eastern Catholic Churches arose.

Ziggurat: A ziggurat ( ; Akkadian: "ziqqurat ", D-stem of "zaqāru " "to build on a raised area") is a massive structure built in ancient Mesopotamia and the western Iranian plateau.  It has the form of a terraced compound of successively receding stories or levels.  Notable ziggurats include the Great Ziggurat of Ur near Nasiriyah, the Ziggurat of Aqar Quf near Baghdad, the now destroyed Etemenanki in Babylon, Chogha Zanbil in Khūzestān and Sialk.

Chogha Zanbil (village): Chogha Zanbil (Persian: چغازنبيل‎ ‎ , also Romanized as Choghā Zanbīl; also known as Chaqā-ye Zanbīl, Choqāy Zanbīl, Choqā Zanbīl, Chowghār Zanbīl, and Ma‘bad-e Choghā Zanbīl) is a village in Shavur Rural District, Shavur District, Shush County, Khuzestan Province, Iran.  At the 2006 census, its population was 81, in 9 families.

Christian O'Brien: Christian Arthur Edgar "Tim" O'Brien, C.B.E (9 January 1914 – 17 February 2001) was a British exploration geologist and author.  In 1936 he was also involved in the discovery of the Chogha Zanbil Ziggurat in Southern Iran.  Appointed by BP In 1967, he retired in 1971 as Chairman of the Boards and General managing director of the Iranian Oil Operating Companies, stationed in Tehran, and was awarded a CBE for services to the Oil Industry.

O'Brien Cogeneration Inc.: O'Brien Cogeneration Inc. is an energy resources industrial company in the United States, which is involved with construction and operation of generation of electrical power from renewable energy technology.  In 2005, O'Brien Cogeneration received one of the highest civil damage awards in the USA for that year.  In particular the Essex County Superior Court rendered a judgment award in the amount of $32,320,360 against Hawker Siddeley for a cause of negligent maintenance, resulting in extensive plant damage and business disruption.  The lead plaintiff attorney in this case was Michael J. Izzo Jr., of the firm of Cozen O'Connor, Cherry Hill, New Jersey.

Liyan: Liyan is an Elamite port on Persian Gulf (near modern-day Bushire, Iran), and first name of Kiririsha (at one stage became the most important goddess of Elam, ranked second only to her husband the god,) where she and Humban had a temple that was erected by Humban-Numena.  There was later (ca. 1250 BC) a temple built to her at Chogha Zanbil.  She was often called 'the Great', or 'the divine mother'.  She seems to have been primarily worshipped in the south of Elam, as another goddess, Pinikir, held her position in the north.  Eventually, by about 1800 BC, the two had merged and the cult of Kiririsha also came to be practised in Susiana.

Chogha Zanbil: Chogha Zanbil (Persian: چغازنبيل‎ ‎ ; Elamite: Dur Untash) is an ancient Elamite complex in the Khuzestan province of Iran.  It is one of the few existent ziggurats outside of Mesopotamia.  It lies approximately 30 km south-east of Susa and 80 km north of Ahvaz.

Igi-Halki: Igi-Halki was a king of Susa and Anshan (Elam) early in 14th century BC.  In one of his inscriptions, he says that “(the goddess) Manzat-Ishtar granted him the kingship of Susa and Anzan...”.  The absence of ancestor kings in this inscription made scholars suggest that he started a new dynasty in Elam, usually called Igihalkids.  Igi-Halki might have been installed by a Babylonian king Kurigalzu I, who conquered Susa about that time.  He is also mentioned as the father of king Attar-kittah on two mace heads found in Chogha Zanbil, and in the inscription of king Shilhak-Inshushinak as the father of kings Pahir-ishan and Attar-Kittah.

Carleton O'Brien: Carleton O'Brien (1903 Providence, Rhode Island-May 1952) was an organized crime figure involved in bookkeeping and policy operations in Rhode Island.  Formerly listed as Public Enemy No. 1 by state officials, O'Brien was one of the last independent racketeers as the Patriarca crime family began establishing themselves in Providence.  He was also an associate of bank robber Joseph "Specs" O'Keefe and was involved in the planning of the Great Brinks Robbery during the early 1950s.

Supporting paragraphs: Christian O'Brien Chogha Zanbil
Answer: Mesopotamia