The Fonta Djallon in Guinea is the source of the Bafing River, north of Mamou. It flows for about and converges with the Bakoy River to join the Senegal River in western Africa. The Bafing River is the largest tributary of the Senegal River, and contributes almost half of its total water volume. The Bafing forms part of the international border between Guinea and Mali.
Irrigation
Flooding from the Bafing River along the Senegal River had been traditionally relied on as a means of supporting local agriculture. However, a drought in the 1970s necessitated the construction of dams on both the Bafing River and the Senegal River. The Manantalihydroelectric dam, completed in 1987, is located on the Bafing River upstream of Bafoulabé. It forms the largest artificial lake in Mali, Lake Manantali. The dam retains of water which is used to power the turbines during the dry season. As a result, the intensity of the maximum flood downstream of the dam has been reduced but during the dry season, a flow of between and is maintained.