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Information about Ohio River

Ohio River, in the east-central United States, is the chief eastern tributary of the Mississippi River. Formed by the joining of the Allegheny and Monongahela rivers at Pittsburgh, Pennsylvania, the Ohio flows northwest and then southwest for 981 miles before joining the Mississippi at Cairo, Illinois. On the way, it forms Ohio's boundary with West Virginia and Kentucky, and Kentucky's boundary with Indiana and Illinois.

The Ohio and its many tributaries drain an area of about 203,000 square miles. As well as Pittsburgh and Cairo, major cities on the Ohio include Cincinnati, Ohio and Louisville, Kentucky. The Ohio often floods in springtime, and many dams and levees (raised banks) have been built to control the river. It is navigable along all its length except at the Ohio Falls, Louisville.

There, a dam and canal enable boats to get round these rapids. The Ohio is thought to have been discovered by a French explorer in 1669. In the 1800's it was a major route to the Mid-west.

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