A major tributary of the Mississippi River in the eastern United States, formed at Pittsburgh by the confluence of the Allegheny and Monongahela rivers and flowing roughly 1,580 kilometers to its junction with the Mississippi. It historically marked a boundary between free and slave states before the American Civil War.
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Source Ohio River (Wikipedia)
Sources
Wikidata: Ohio River
Ohio River (Wikipedia)
Shaped By: Glaciation, Upper Ohio RiverQuote, Shaped By: Glaciation, Upper Ohio River
The upper Ohio River formed when one of the glacial lakes overflowed into a south-flowing tributary of the Teays River.
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