Course
The Kerio River rises on the north slopes of the Amasya Hills to the west of Lake Bogoria. It flows northward through the Kerio Valley between Tugen Hills and Elgeyo Escarpment. The Elgeyo Escarpment rises to over 1,830 metres (6,000 ft) above the Kerio valley in places. The Kerio continues northward, often through deep and narrow valleys, to enter Lake Turkana in a delta just south of the delta formed by the Turkwel and Lokichar rivers. The Kerio and Turkwell contribute 98% of the river water flowing into Lake Turnana. In their lower courses both these rivers are seasonal.
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