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Updated: July 18, 2026
The second great blow to the system followed the Mongol conquest, when the Nahrwân Canal, to the east of the Tigris, had its head swept away by flood and the area it had irrigated became desert. Then, in about the fifteenth century, the Tigris returned to its old course; the Shatt el-Hai shrank, and much of the Great Swamp dried up into the desert it is to-day.
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