Hagerstown Valley is part of a larger valley region that stretches from Quebec to waht US state?
Hagerstown Valley:  It is part of the Great Appalachian Valley, which continues northward as Cumberland Valley in Pennsylvania, and southward as Shenandoah Valley in West Virginia and Virginia. Great Appalachian Valley:  The trough stretches about 1200 mi from Quebec to Alabama and has been an important north-south route of travel since prehistoric times.
Alabama