The 130 mile Monongahela River flows generally north in Pennsylvania and joins the Allegheny at Pittsburgh to form the Ohio. The Cheat River enters the Monongahela from the right, or east, near what was the Virginia—Pennsylvania boundary, and the Youghiogheny runs into the Monongahela about fifteen miles from Pittsburgh.
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Citation
Citation:
The Papers of George Washington Digital Edition, ed. Theodore J. Crackel. Charlottesville: University of Virginia Press, Rotunda, 2008.