For 10 points, name this lake which shares its name with a country whose capital is N'Djamena.
The Chari River is largest source for this body of water, providing about 90% of its water supply. Geologists speculate that it was once a remnant of a former inland sea that continuously grows and shrinks over 3 million year spans; this explains why its depth is only 11 meters. Cameroon and Niger were once in conflict over who actually had control of this lake, but the dispute was settled when its namesake country claimed it. For 10 points, name this lake which shares its name with a country whose capital is N'Djamena.
The Chari River is largest source for this body of water, providing about 90% of its water supply.
Lake {Chad}