Which river's annual floods supported ancient agriculture in Africa?

• A. Tigris
• B. Danube
• C. Indus
• D. Nile

Answer: (D)

Predictable river floods create fertile soil and reliable irrigation, which let farming flourish and support growing populations and complex societies. The Nile’s annual floods deposited nutrient-rich sediment across its floodplain, creating vast, fertile fields along the river and in the delta. After each flood, farmers could plant and harvest with a dependable cycle, enabling surplus, storage, and the rise of centralized governance, religion, and monumental architecture in ancient Egypt. The other rivers listed come from different regions—one in Mesopotamia, another in the Indian subcontinent, and another in Europe—so their flood patterns and regional impacts differ from Africa’s Nile, making the Nile the river whose regular flooding most directly supported ancient agriculture in Africa.