Pennsylvania probably has the largest trail system of the eastern states. The terrain is varied and includes high plains and mountain ridges.

Of the Appalachian Trail, 230 miles are within this state.

Many longer and shorter trails can be found in Pennsylvania. The Mason-Dixon Trail (190 miles), the Mid State Trail (319 miles),  the Baker Trail (140 miles), the Horse Shoe Trail (134 miles), the Tuscarora Trail (252 miles), the Great Allegheny Passage (318 miles) and the Highlands Trail.

Some of the American long distance trails pass through Pennsylvania: the North Country Trail, East Coast Greenway, Eastern Continental Trail and the Great Eastern Trail.

There are many smaller state forests. A large one is the Allegheny National Forest, located on the hilly Allegheny Plateau.