Ogobay, Or Ogowai, a large river of Avestern Africa, near lat, 1° S., flowing into the Atlantic through an extensive delta, of which the principal branches are the Nazareth, with its inouth in lat. 0° 41' S.; the Mexias, in lat. 0° 56' S.; and the N'pooloonai, reaching the sea in lat. 1° 17' S. through the mouth of the Fernand Vaz, with which river it unites about 10 m. inland. It was discovered by Du Chail-lu in 1856, and is formed, about 100 m. from the seaboard and about 40' S. of the equator, by the junction of the Okanda, supposed to be the' main stream, from the northeast, with the N'gooyai, from the south. It has been explored by French government expeditions as far as this point, up to which it is navigable in the rainy season. Even in the dry season, when its level is 15 ft. lower, it is practicable for light-draught steamers up to Goombi, a town of the Camma people, 95 m. from the mouth. About 40 m. from the coast the Ogobay receives the outflow of a large lake 10 m. wide, communicating with it on the S. bank by a stream 5 m. long.

According to Du Chaillu, the Okanda and N'gooyia, which unite to form the Ogobay, are the only rivers that break through the coast chain of mountains, and between the Niger and the Congo there is no other knowm river that brings down so large a quantity of water as the Ogobay.