This 2,155-mile national scenic trail from Maine to Georgia cuts across southeastern Pennsylvania between New Jersey and the Mason-Dixon Line at Maryland. The Appalachian Trail (A.T.) traverses ridges and dips through the gaps, logging some of its most rugged miles within the state. The Pennsylvania leg, at over 230 miles, takes the better part of a month to complete. Opened spring through fall. Contact Appalachian Trail Conference for more information.