Which major river empties into the Gulf of Guinea?
Gulf of Guinea gives a thorough description: The name "Guinea" was also applied to south coast of West Africa, north of the Gulf of Guinea, which became known as "Upper Guinea", and the west coast of Southern Africa, to the east, which became known as "Lower Guinea". The name "Guinea" is still attached to the names of three countries in Africa: Guinea, Guinea-Bissau, and Equatorial Guinea, as well as New Guinea in Melanesia. The main river shedding its waters in the gulf is the Niger River. Different definitions of the geographic limits of the Gulf of Guinea are given; the International Hydrographic Organization
Gulf of Guinea defines the southwest extent of the Gulf of Guinea as "A line from Cap Lopez (), in Gabon, northwestward to Ihléu Gago Coutinho (Ilhéu das Rôlas) (); and thence a line from Ihléu Gago Coutinho northwestward to Cape Palmas (), in Liberia. The Gulf of Guinea contains a number of islands, the largest of which are in a southwest-northeast chain, forming part of the Cameroon line of volcanoes. Annobón, also known as Pagalu or Pigalu, is an island that is part of Equatorial Guinea. Bobowasi Island is an island off the west coast of Africa in the Gulf of Guinea