CEVAP:

Some 10,000 years ago, the African landscape was transformed by environmental change. The Sahara Desert became a marked dryland whereas the region south of the Sahara formed a savannah and tropical forest. North of the Sahara was the moderate North African region. The northeastern part of Africa, beginning from southeastern Egypt to the tip of the Horn of Africa, including the regions across the Red Sea. Western and southwestern Arabia shared identical topographical features, marked by hilly and mountainous, rainy deciduous forests and grassy lands. This region linking Arabia and Eastern African includes the topographical characteristics of the Rift Valley in its eastern section, and the Nile Valley on its western edges.