African Humid Period: The Green Sahara

Beginning approximately 11,000 years ago and peaking around 9,000 BCE, the African Humid Period transformed the Sahara from hyperarid desert into a landscape of rivers, lakes, and savannah grassland. Driven by Milankovitch orbital precession intensifying the West African Monsoon, the period enabled widespread human settlement across what is now the Sahara Desert, and archaeological evidence includes rock art, canoes, and pastoral settlements in regions currently uninhabitable. When the period ended around 5,500 years ago, populations migrated toward the Nile Valley and Mesopotamia, contributing to the conditions that gave rise to early complex societies including Pharaonic Egypt.