<P> On March 15, 2015, a hiker was killed near the Ed Garvey shelter in the southern part of the state's portion of the trail when a large tree fell on him . </P> <P> Counties crossed: Franklin County → Cumberland County → Perry County → Dauphin County → Lebanon County → Schuylkill County → Berks County → Lehigh County → Carbon County → Northampton County → Monroe County </P> <P> Pennsylvania has 229.6 miles (369.5 km) of the trail, extending from the Pennsylvania - Maryland border at Pen Mar, a tiny town straddling the state line, to the Delaware Water Gap, at the Pennsylvania - New Jersey line . The Susquehanna River is generally considered the dividing line between the northern and southern sections of the Pennsylvania AT . The AT crosses the Susquehanna via the Clarks Ferry Bridge, near Duncannon . </P> <P> In the southern half of the state, the AT passes through Caledonia State Park, Michaux State Forest, and Pine Grove Furnace State Park (the actual midpoint of the AT was slightly moved and is now over just under a half - mile west of PGF State Park and is marked by a "Midpoint" sign). These areas in south central Pennsylvania are the northernmost portions of the Blue Ridge Mountains, which are geologically distinct from the Ridge and Valley section further north . The two parts are separated by the broad Cumberland Valley, where the trail has a change of scenery, crossing many farms and large highways . There is no camping allowed in the 18 - mile (29 km) stretch between Alec Kennedy and Darlington shelters . </P>

Where does the appalachian trail cross the susquehanna river