The document discusses four early river valley civilizations: the Sumerian civilization along the Tigris and Euphrates Rivers, the Egyptian civilization along the Nile River, the Harappan civilization along the Indus and Ganges Rivers, and the Chinese civilization along the Yellow River. It then provides details on the basis of ancient civilizations including culture, government, economy, beliefs, and religion. Physical characteristics of early civilizations and the Fertile Crescent region are also described.