Niger river

The Niger River is the principal river of western Africa, extending over 2500 miles (about 4180 km). It runs in a crescent through Guinea, Mali, Niger, on the border with Benin and then through Nigeria, discharging through a massive delta, known as the Niger Delta of the Oil Rivers, into the Gulf of Guinea. The Niger is the third-longest river in Africa, exceeded only by the Nile and the Congo River (also known as the Zaïre River). Its main tributary is the Benue River.
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Noun
1. an African river; flows into the South Atlantic
(synonym) Niger
(hypernym) river
(part-holonym) Guinea, Republic of Guinea, French Guinea