Which early urbanized area is commonly called the Fertile Crescent?

The Fertile Crescent is the curved region of fertile land in Southwest Asia where some of the earliest cities and civilizations developed. Mesopotamia, located between the Tigris and Euphrates Rivers, was a central part of this region. The Nile River Valley, Indus River Valley, and Mesoamerica were other early civilization centers, but they are not commonly called the Fertile Crescent.

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