1) Tigris and Euphrates river valley is where the Mesopotamia civilization began. Mesopotamia means "between the rivers". It was a Sumerian-Babylonian civilization.
2) Nile river valley was home to agricultural settlers in 5500 BCE. and its Egypt civilization started to grow around 3100 BCE.
3) Indus river valley. Civilization arose in 2600 BCE but fell due to its environment. Currently identified as Pakistan and India.
4) Yellow River valley in China. Civilization emerged in 1700 BCE and was known as the Huang-He River Civilization.
