How long is the extension of the blue ridge mountain range that Nichol's Gap Road was built over?
Nichol's Gap Road: The Nichol's Gap Road was a central Pennsylvania highway established in the 18th century near Maryland extending westward from the Black's Gap Road "just west of Little Conewago Creek" at the "Crofs Keys" stand of James Black. South Mountain (Maryland and Pennsylvania): South Mountain is the northern extension of the Blue Ridge Mountain range in Maryland and Pennsylvania.
i don't know