Formed by the confluence of the [Allegheny River, Allegheny]
? and Monongehela
? Rivers at Pittsburgh
?, the Ohio forms part of the border between
Ohio and
West Virginia, between
Ohio and
Kentucky, between
Ohio and
Indiana, and between
Illinois and
Kentucky before joining the
Mississippi at [Cairo, Illinois]
?.
Since it was considered by pre-Columbian inhabitants of eastern North America to be part of a single river continuing on through the lower Mississippi, it is perhaps an understatement to characterize the Ohio as a mere tributary of the Mississippi.
Besides Pittsburgh, other cities along the Ohio include: