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The eastern border of Mesopotamia. The Tigris became the primary connection between Baghdad and the trade centers to the east in India and China. The choice of the Tigris as Baghdad's founding point is largely because of the "The Great Swamp," which makes the Euphrates dangerous to navigate. The Tigris also moves significantly faster than the Euphrates, making it more beneficial for ships to transverse.See Also: Euphrates River, "The Great Swamp," Arvandrud River.