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Tibesti, which means "place where the mountain people live", is the domain of the Toubou people. The Toubou live mainly along the wadis, on rare oases where palm trees and limited grains grow. They harness the water that collects in gueltas, the supply of which is highly variable from year-to-year and…

Average elevation: 3,133 ft

Lake Chad is divided into north and south parts by a shallow sill called the Great Barrier, with the bottom of the northern basin at an altitude of 275.3 m (903 ft) and the bottom of the southern basin at 278.2 m (913 ft). When the water level in the south exceeds 279 m (915 ft) above sea level, it will flow…

Average elevation: 925 ft

Average elevation: 965 ft

Average elevation: 1,207 ft

Average elevation: 1,207 ft

Average elevation: 1,991 ft

Average elevation: 2,182 ft

Lake Chad has shrunk considerably since the 1960s, when its shoreline had an elevation of about 286 metres (938 ft) above sea level and it had an area of more than 26,000 square kilometres (10,000 sq mi), making its surface the fourth largest in Africa. An increased demand on the lake's water from the local…

Average elevation: 925 ft

Average elevation: 1,155 ft

Average elevation: 1,273 ft

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Average elevation: 965 ft

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Average elevation: 981 ft

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