How long is the extension of the blue ridge mountain range that Nichol's Gap Road was built over?
South Mountain (Maryland and Pennsylvania) 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 mi 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 a portion of Pennsylvania.
Collier Mountain Collier Mountain is mountain in the Ridge and Valley region of the Appalachian Mountains, located in Allegany County, Maryland. The 1457 ft ridge is approximately 5 mi southeast of Cumberland. It runs 6 mi northeast from the North Branch Potomac River near its confluence with Patterson Creek to Murley Branch south of Breakneck Hill.