Ohio River - Wikipedia, the free encyclopedia
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The Ohio River is a principal tributary of the Mississippi River, 1,579 km (981 mi) long in the eastern United States.
Of great significance in the history of North America dating from the time of the Native Americans, the river was a primary transportation route during the westward expansion of the early U.S. It flows through or along the border of six states, and its watershed encompasses 14 states, including many of the states of the southeastern U.S. through its largest tributary, the Tennessee. During the eiighteenth century it was the southern boundary
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The river is formed by the confluence of the Allegheny and Monongahela rivers at The Point of Pittsburgh. From Pittsburgh, it flows to the northwest through western Pennsylvania, before making an abrupt, almost 180 degree, turn to the south-southwest at the West Virginia state line, from which point it forms the border between West Virginia and Ohio. The river then follows a roughly southwestern and then western course between Kentucky and Ohio, Indiana, and Illinois until it joins the Mississippi from the east at Cairo, Illinois. [1]
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