The Egyptian civilization around the Nile river, the Mesopotamian/Sumerian civilization around the Tigris and Euphrates, the Indus Valley civilization of Harappa and Mohenjo-Daro around the Indus river, and the Chinese/Shang civilization around the Yellow river.
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The four main river valley civilizations were:
1) Summarian civilization with the Tigris and Euphrates Rivers (Mesoptamia)
2) Egyptian civilization with the Nile River
3) Harappon civilization with the Indus River
4) Ancient China with the Huang He River
Early civilizations emerged between the Tigris, Euphrates, Nile, and (sorry, blanking out out on the fourth...) Rivers.
as humans developed agriculture, they were able to stop following herds of animals and build towns and cities.
The Egyptians need to drink the water, they need them to travel and they need the water to grow crops.
The main reason for this insularity was their location, a rich river valley surrounded by desert. It was in this environment that they developed their sophisticated civilisation unmolested for thousands of years by outsiders. Like most insular societies it reached a certain level of technology and stopped.
the nile river
There are actually four main characters in the story of Echo and Narcissus: Zeus, Hera, Echo, Narcissus.