Over 8,000 years ago, early city life began around writing and agriculture.
Initial urban adventures started around 10,000 to 8,000 years ago, with some structured urban evidence around 5,000 to 6,000 years ago.
Initial urban civilizations emerged in four key regions: Egypt (Nile River), Mesopotamia (Tigris and Euphrates Rivers), Indus Valley, and ancient China (Huang He River).
Civilization indicators include developed language, socio-political organization, economic systems, and infrastructure.