In the ancient world, why did civilizations flourish around great river valleys?

Question

River valleys protected citizens from natural disasters.
River valleys provided an ideal environment for agriculture.
River valleys sheltered citizens from harsh weather.
River valleys contained vast mineral resources.

Answer 1

River valleys provided an ideal environment for agriculture.

The regular flooding of rivers deposited nutrient-rich soil, making the land fertile and suitable for farming. This allowed civilizations to grow surplus crops, support larger populations, and develop more complex societies. Additionally, rivers provided a consistent source of water for irrigation, which further supported agricultural activities. The abundance of food and resources in these river valleys helped civilizations flourish and thrive.