The Cumberland Valley is a northern constituent valley of the Great Appalachian Valley, within the Atlantic Seaboard watershed in Pennsylvania and Maryland. The Appalachian Trail crosses through the valley.
Location: Cumberland County, Pennsylvania · Franklin County, Pennsylvania · Washington County, Maryland
Floor elevation: 600 ft (180 m)
Length: 73 miles (117 km) northeast-southwest
Width: 12 miles (19 km)
Population centers: In Pennsylvania: Harrisburg, Carlisle, Mechanicsburg, Shippensburg, Chambersburg, Greencastle, Waynesboro · In Maryland: Hagerstown
Borders on: Ridge-and-Valley Appalachians (west/north) · South Mountain (east/south) · Susquehanna River (east) · Potomac River (south)
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