Igbo population density

Tracing Ancient Migrations: The Green Sahara, Eri, and the Roots of Southern Nigerian Civilizations

In the lush greenery, expansive lakes, and thriving communities—thousands of years ago during the Neolithic Subpluvial, a period when the now-arid desert was a fertile savanna. This “Green Sahara,” which periodically transforms every few thousand years due to Earth’s axial tilt, was a cradle for ancient populations until its drying around 3000 BCE forced migrations…