Potomac River, rising in the Alleghany Mountaine, flows 400 m. eastward between Maryland and the Virginias into Chesapeake Bay; the Shenandoah is the chief tributary. The river is navigable as far up as Cumberland, and is tidal up to Washington, which is on its banks.
Definition taken from The Nuttall Encyclopædia, edited by the Reverend James Wood (1907)
Potemkin * Potosi