Lake Turkana, the world's largest permanent desert lake and the world's largest alkaline lake.

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Lake Turkana (tər-kăn'ə, tʊr-kä'nə), formerly known as Lake Rudolf, is a lake in the Great Rift Valley in Kenya, with its far northern end crossing into Ethiopia.[1] It is the world's largest permanent desert lake and the world's largest alkaline lake. By volume it is the world's fourth largest salt lake after the Caspian Sea, Lake Issyk-Kul and the (shrinking) Aral Sea, and among all lakes it ranks twentieth.

Source: Wikipedia