Based on the map, why was Fertile Crescent favorable for early settlements?

In a region of the world where much of the land is too dry for farming, the Fertile Crescent is a rich food-growing location. Natural resources that enabled people to settle in one location were created by the muddy, swampy land between the Tigris and the Euphrates rivers.

Explanation:

well considering i can't see the graph, it's probably prices

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