Kerio Valley, lies between the Tugen Hills and the Elgeyo Escarpment in Kenya. It sits at an elevation of 1,000 meters in the Great Rift Valley.

The Kerio Valley is the site of elaborate irrigation systems that were constructed during earlier periods of history. These structures are believed to have been built by descendants of the Neolithic Afro-Asiatic peoples who introduced domesticated plants and animals to the Great Lakes region a succession of societies collectively known as the Stone Bowl cultural complex.

Most of these early northern migrants are said to have been absorbed by later movements of Nilotic and Bantu peoples.