I've spent a lot of time hiking all of the sections of this 312 mile trail that intersects Pennsylvania. Running north and south, the MST is a rocky, bunpy, dry, and wonderful route designed by Tom Thwaites. The trail uses the metric system, which I think is great. The northern section of trail is remote and difficult as it climbs up and over several mountains. The central section is just about as rocky as could be, and the southern section runs along top of rocky ridgelines, with a lot of private property and state gamelands as well as state forests.