Sahara: Eastern.

The most thorough and detailed studies on the prehistory of North Africa come from the land included within the present borders of Egypt and northern Sudan. The Eastern Sahara is presently almost uninhabited by people or animals, but it has not always been so. The Nile River and the Sahara Desert have affected each other on both cultural and environmental levels and Eastern Saharan populations have often acted as intermediaries between Central Saharans and Nilotic peoples, often even linking populations and traditions between East and North Africa.