 The Iraqw have traditionally been viewed as remnants of a Neolithic Afro-Asiatic peoples who practiced agriculture and animal husbandry in the Great Lakes region — a succession of societies collectively known as the "Stone Bowl" cultural complex.Most of these early northern migrants are believed to have been absorbed by later movements of Nilotic and Bantu peoples.In the Kerio Valley of Kenya, among other neighboring areas, there are vestiges of the Neolithic tillers' civilization in the form of elaborate irrigation systems.