The Songosongo Archipelago or The Songosongo Islands (''Visiwa vya Songosongo'', in

Swahili Swahili may refer to: * Swahili language, a Bantu language officially used in Tanzania, Kenya and Uganda and widely spoken in the African Great Lakes. * Swahili people, an ethnic group in East Africa. * Swahili culture, the culture of the Swahili p ...

) is a group of islands in

Kilwa District Kilwa District (''Wilaya ya Kilwa'' in Swahili) is one of six administrative districts of Lindi Region in Tanzania. The District covers an area of . The district is comparable in size to the land area of the nation state of East Timor. Kilwa di ...

Lindi Region Lindi Region (''Mkoa wa Lindi'' in Swahili language, Swahili) is one of Tanzania's 31 administrative Regions of Tanzania, regions. The region covers an area of . The region is comparable in size to the combined land area of the nation state of Sr ...

's coast on the

Sea of Zanj The Sea of Zanj (; ) is a former name for the portion of the western Indian Ocean adjacent to the region in the African Great Lakes referred to by medieval Arab geographers as Zanj.

Tanzania Tanzania, officially the United Republic of Tanzania, is a country in East Africa within the African Great Lakes region. It is bordered by Uganda to the northwest; Kenya to the northeast; the Indian Ocean to the east; Mozambique and Malawi to t ...

's Indian Ocean coast. The

archipelago An archipelago ( ), sometimes called an island group or island chain, is a chain, cluster, or collection of islands. An archipelago may be in an ocean, a sea, or a smaller body of water. Example archipelagos include the Aegean Islands (the o ...

is composed of 21

coral reef A coral reef is an underwater ecosystem characterized by reef-building corals. Reefs are formed of colonies of coral polyps held together by calcium carbonate. Most coral reefs are built from stony corals, whose polyps cluster in group ...

s including the 4

coral island A coral island is a type of island formed from coral detritus and associated organic material. It occurs in tropical and sub-tropical areas, typically as part of a coral reef which has grown to cover a far larger area under the sea. The term low ...

s. In total, the archipelago covers a land area of , and has an average elevation of . The four Islands in the archipelago are Fanjove, Nyuni Island, Songo Songo and Okuza Island. Tanzania's geological history is very similar to that of Western Australia's northwest shelf. It has rifting from the

late Jurassic The Late Jurassic is the third Epoch (geology), epoch of the Jurassic Period, and it spans the geologic time scale, geologic time from 161.5 ± 1.0 to 143.1 ± 0.8 million years ago (Ma), which is preserved in Upper Jurassic stratum, strata.Owen ...

, then sags in the

Cretaceous The Cretaceous ( ) is a geological period that lasted from about 143.1 to 66 mya (unit), million years ago (Mya). It is the third and final period of the Mesozoic Era (geology), Era, as well as the longest. At around 77.1 million years, it is the ...

and Tertiary continental shelves. The largest

natural gas Natural gas (also fossil gas, methane gas, and gas) is a naturally occurring compound of gaseous hydrocarbons, primarily methane (95%), small amounts of higher alkanes, and traces of carbon dioxide and nitrogen, hydrogen sulfide and helium ...

deposits in Tanzania are located in the Songosongo archipelago. The Islands have been found to contain 20 million tonnes worth of natural gas within the archipelago.Dube, Opha Pauline. “Impact of Climate Change, Vulnerability and Adaptation Options: Exploring the Case for Botswana through Southern Africa: A Review.” Botswana Notes and Records, vol. 35, Botswana Society, 2003, pp. 147–68, http://www.jstor.org/stable/40980347.

References

Coastal islands of Tanzania Islands of Lindi Region Islands of Tanzania {{Lindi-geo-stub