Lake Turkana is situated in the Great Rift Valley in the northwestern part of Kenya. Its size is 6,750 km ² (surface area). Volcanic activity was frequent during the creation of the Rift Valley and lavas from the Quaternary and Tertiary ages cover much of the floor of the valley in Kenya. The main tributary is the River Omo, which enters the lake from the north and contributes more than 90% of the total water influx. Other rivers are temporary, flooding only during sporadic rains. Lake Turkana has no outlet, and water is lost from the lake mainly by evaporation. The evaporation rate has been estimated at 2,335 mm a year.

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