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The Ohio River, which flows westward from Pittsburgh, Pennsylvania, to Cairo, Illinois, is the largest tributary, by volume, of the Mississippi River in the United States. At the confluence, the Ohio is considerably bigger than the Mississippi (by long-term mean discharge, Ohio at Cairo: 281,500 cu ft/s (7,960 m<sup>3</sup>/s); Mississippi at Thebes: 208,200 cu ft/s (5,897 m<sup>3</sup>/s)) and, thus from a hydrological perspective, is the main stream of the whole river system.
Ohio River