The Niger Delta is the delta of the Niger River sitting directly on the Gulf of Guinea on the Atlantic Ocean in Nigeria. It is located within nine coastal southern Nigerian states, which include: all six states from the South South geopolitical zone, one state (Ondo) from South West geopolitical zone and two states (Abia and Imo) from South East geopolitical zone. The Niger Delta is a very densely populated region sometimes called the Oil Rivers because it was once a major producer of palm oil. The area was the British Oil Rivers Protectorate from 1885 until 1893, when it was expanded and became the Niger Coast Protectorate. The delta is a petroleum-rich region and has been the center of international concern over pollution that has resulted principally from major oil spills of multinational corporations of the petroleum industry. Geography The Niger Delta, as now defined officially by the Nigerian government, extends over about and makes up 7.5% of Nigeria's land mass. Historically and cartographically, it consists of present-day Bayelsa, Delta, and Rivers States. In 2000, however, Obasanjo's regime included Abia, Akwa-Ibom, Cross River State, Edo, Imo and Ondo States in the region. The Niger Delta and the South South geopolitical zone (which contains six of the states in Niger Delta) are two different entities. The Niger Delta separates the Bight of Benin from the Bight of Bonny within the larger Gulf of Guinea. Demographics Some 31 million people of more than 40 ethnic groups including the Ukwuani people, Abua, Bini, Ohaji/Egbema, Itsekiri, Efik, Esan, Ibibio, Annang, Oron, Ijaw, Igbo, Isoko, Urhobo, Kalabari, Yoruba, Okrika, Ogoni, Ogba–Egbema–Ndoni, Epie-Atissa people and Obolo people, are among the inhabitants of the political Niger Delta, speaking about 250 different dialects. Language groups spoken in the Niger Delta include the Ijaw languages, Ibibio-Efik languages, Igboid languages, Itsekiri language, Central Delta languages, Edoid languages, and Yoruboid Languages, History Colonial period The area was the British Oil Rivers Protectorate from 1885 until 1893, when it was expanded and became the Niger Coast Protectorate. The core Niger Delta later became a part of the eastern region of Nigeria, which came into being in 1951 (one of the three regions, and later one of the four regions). The majority of the people were those from the colonial Calabar, Itsekiri and Ogoja divisions, the present-day Ogoja, Itsekiri, Annang, Ibibio, Oron, Efik, Ijaw and Ogoni people. The National Council of Nigeria