Ohio Valley | Encyclopedia.com
https://www.encyclopedia.com/places/united-states-and-canada/us-physical-geography/ohio-valley
webMay 9, 2018 · OHIO VALLEY. The Ohio River drains into a fertile basin that measures 203,000 square miles (528,101 square kilometers) — stretching across Ohio, West Virginia, Indiana, Illinois, and Kentucky. The river is formed by the confluence of the Allegheny and Monongahela rivers at Pittsburgh, Pennsylvania. From there the Ohio flows southwest, …
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