Tags: Mountain Range.
South Mountain is the northern extension of the Blue Ridge Mountain range in Maryland and Pennsylvania. From the Potomac River near Knoxville Maryland in the south to Dillsburg Pennsylvania in the north the 70-mile (110 km) long range separates the Hagerstown and Cumberland valleys from the Piedmont regions of the two states. The Appalachian National Scenic Trail follows the crest of the mountain through Maryland and part of its portion in Pennsylvania.
