The Mid State Trail System (MST) is a long distance hiking trail, the longest and wildest footpath in Pennsylvania. Over 500 km long, MST stretches from the Mason-Dixon Line near Flintstone, MD, through the center of PA to end at the NY State line just north of Cowanesque Lake. Much of MST is on public land: state forests, game lands and parks, MST also passes through some private land by permission. From the Maryland border to Centre County, the MST consists largely of rocky ridgetop trail that makes for a rugged and demanding hike, with many outstanding vistas. Beyond Centre County, the MST follows many old trails and road or railroad grades, with the occasional hedgerow. The MST is marked with rectangular orange blazes on the main trail and yellow or red blazes on side trails. Principal features of the MST are its many views, side trails and fragile illusion of isolation and wilderness. It is also part of the Great Eastern Trail (http://www.greateasterntrail.net) footpath network. In cooperation with DCNR, sections of this trail are maintained, in part, by volunteers from the Mid State Trail Association.