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.
North Carolina Highway 89 North Carolina Highway 89 (NC 89) is a 61 mi east–west state highway route that mainly runs through small communities and towns in northern North Carolina including Mount Airy and Danbury. The entire route spans only two counties in the state: Surry and Stokes. It can be accessed from the Blue Ridge Parkway via Virginia's State Route 89 (the highway that continues from NC 89's western terminus) or an interchange with NC 18 which intersects NC 89 near its western terminus. Interstates 77 and 74 both intersect NC 89 west of Mount Airy.