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The Fertile Crescent
The arc of first farming, from the Nile to the Gulf
The Fertile Crescent is a shape drawn on a map by the American Egyptologist James Henry Breasted, who used it in a 1916 textbook for the arc of well-watered land that curves up from the Nile through the Levant, bends east along the Taurus foothills, and comes down the Tigris and Euphrates to the Persian Gulf. It is a teaching device that stuck. Because nobody ever agreed on its edges, it appears in different sizes in different books, and whether Egypt belongs at all is still argued: Breasted included the Nile, many later scholars cut it out. It overlaps Mesopotamia without being the same thing, since Mesopotamia is only its eastern limb.
The crescent traces the zone where enough rain falls to farm without irrigation, roughly 200 to 400 millimeters a year, wrapped around the dry interior of Syria and Arabia like a green rind. Its western arm runs along the Mediterranean and up the Jordan rift past Mount Hermon at 2,814 meters; its northern arc follows the foothills of the Taurus and the Zagros, where wild wheat, barley, lentils, and chickpeas still grow; its eastern arm descends into the Mesopotamian floodplain. That upland fringe is the whole point. The wild ancestors of most Old World crops and of all but one of its large domesticated animals lived inside this narrow, curving band of hills.
Somewhere along that fringe, around 10,000 BCE, people began planting what they had gathered and keeping what they had hunted, and within a few thousand years there were villages, granaries, pottery, walls, and eventually the cities of Sumer downstream. Wheat, barley, peas, lentils, sheep, goats, pigs, and cattle were all domesticated here, and from this arc they spread to feed Europe, North Africa, and much of Asia. The crescent is why the phrase cradle of civilization exists, and also why it is contested: China, the Indus Valley, Mesoamerica, and the Andes each crossed the same threshold independently. Much of the arc today is dry, disputed, and, in Syria and Iraq, at war.