Correct Option (b)
Lake Faguibine, situated in northern Mali, was historically a large freshwater lake system. It has undergone severe desiccation, particularly since the late 1980s. This decline is attributed to reduced rainfall, a consequence of climate change, and significant upstream water diversion. Despite a return to normal rainfall patterns after 2000, the lake system failed to recover, leading to the transformation of much of its basin into arid land or desert.
Incorrect Options
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Lake Victoria: This is one of Africa's Great Lakes, located in East Africa (shared by Tanzania, Uganda, and Kenya). It is the largest freshwater lake in Africa by area and remains full, serving as a vital ecosystem and water source.
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Lake Oguta: Located in southeastern Nigeria, Lake Oguta is a freshwater lake that is still intact and has not dried up or turned into a desert.
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Lake Volta: Situated in Ghana, Lake Volta is one of the largest man-made reservoirs in the world by surface area. It was formed by the Akosombo Dam and remains a functional and significant water body.