Which areas of western Africa drain toward the Lake Chad basin?

The Lake Chad basin is the largest inland drainage area in Africa, situated in the Sahel zone of west-central Africa at the intersection of Chad, Cameroon, Nigeria, and Niger.123

The lake is primarily fed by the Chari and Logone river system, which accounts for approximately four-fifths of the total inflow. The Chari River originates from headstreams in the Central African Republic to the south, while the Logone flows along the frontier of Cameroon.143

Additional drainage into the basin is provided by the Ebeji (El-Béid) and Yedseram rivers, as well as the Komadugu Yobe. These river systems collect water from the surrounding landscape, though they face ongoing challenges from climate variability, water withdrawals for irrigation, and the risk of water capture by opposing drainage systems.423