Question

why did the civilizations flourished in the river valleys?​

Answer 1

Rivers were attractive locations for the first civilizations because they provided a steady supply of drinking water and made the land fertile for growing crops. Moreover, goods and people could be transported easily, and the people in these civilizations could fish and hunt the animals that came to drink water.

Answer 2

A river valley civilization is an agricultural nation or civilization situated beside and drawing sustenance from a river. A "civilization" means a society with large permanent settlements featuring urban development, social stratification, specialization of labor, centralized organization, and written or other formal means of communication.