The earliest urban civilizations were most often built near what?

Question

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The earliest urban civilizations were most often built near river systems because of the access to water for irrigation, transportation, and trade. Examples include the Nile River in Egypt, the Tigris and Euphrates Rivers in Mesopotamia, and the Indus River in South Asia. Coastlines and defensible mountains were also important factors in the development of civilizations, but they were not as central as river systems.

The Earliest Urban Civilizations Were Most Often Built near What