river in West Africa, rising 25 miles (40 km) southwest of Bobo Dioulasso, Burkina Faso (formerly Upper Volta), and forming part of the Burkina Faso–Côte d'Ivoire boundary before entering Côte d'Ivoire to flow southward and empty into its estuary on the Gulf of Guinea. Its total length is 466 miles (750 km). Its upper course flows through a savanna region and marks the western border of the Bouna Game Reserve, Côte d'Ivoire. Its middle section enters tropical rain forest and is the traditional boundary between the Anyi (Agni) and Baule (Baoule) peoples, and its lower course passes through a region noted for its timber (sipo and mahogany), pineapples, coffee, cocoa, and bananas. The river is navigable from Alépé, 30 miles (48 km) upstream, to the coast.