South Mountain (Maryland and Pennsylvania)

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South Mountain
Northward view of South Mountain near Interstate 70 in Maryland
Highest point
Peak	Quirauk Mountain
Elevation	2,150 ft (660 m)
Coordinates	39°41′46″N 77°30′47″W / 39.696°N 77.513°W / 39.696; -77.513
Dimensions
Length	70 mi (110 km)
Width	12 mi (19 km)
Geography
Appalachian Mountains
Country	United States
States	Maryland and Pennsylvania
Range coordinates	39°43.2′N 77°29.5′W / 39.7200°N 77.4917°W / 39.7200; -77.4917
Parent range	Blue Ridge Mountains
Geology
Orogeny	Grenville orogeny
Type of rock	Granite, gneiss and limestone

South Mountain is the northern extension of the Blue Ridge Mountain range into Maryland and Pennsylvania. From the Potomac River near Knoxville, Maryland in the south to Dillsburg, Pennsylvania in York County, Pennsylvania in the north, the 70-mile-long (110 km) range separates the Hagerstown and Cumberland valleys from the Piedmont regions of the two states.

The Appalachian Trail follows the crest of the mountain through Maryland and a portion of Pennsylvania.