Ohio (river)
River in east-central USA, 1,579 km/981 mi long and 365–1,220 m/1,200–4,005 ft wide; the second-largest tributary of the Mississippi; navigable throughout its length. It is formed by the union of the Allegheny and Monongahela rivers at Pittsburgh, Pennsylvania, and flows southwest to join the Mississippi at Cairo, Illinois.
© RM 2012. Helicon Publishing is division of RM.
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