Appalachian Trail

The Appalachian Trail is a National Scenic Trail as designated by Congress.  It runs 2186 miles from Springer Mountain in Georgia to Mount Katahdin in Maine.

From National Park Service:

The Appalachian Trail is a 2,185 mile long public footpath that traverses the scenic, wooded, pastoral, wild, and culturally resonant lands of the Appalachian Mountains. Conceived in 1921, built by private citizens, and completed in 1937, today the trail is managed by the National Park Service, U.S. Forest Service, Appalachian Trail Conservancy, numerous state agencies and thousands of volunteers.

From Wikipedia:

The Appalachian National Scenic Trail, generally known as the Appalachian Trail or simply the A.T., is a marked hiking trail in the eastern United States extending between Springer Mountain in Georgia and Mount Katahdin in Maine. The trail is approximately 2,200 miles (3,500 km) long, though the precise length changes over time as parts are modified or rerouted. The trail passes through the states of Georgia, North Carolina, Tennessee, Virginia, West Virginia, Maryland, Pennsylvania, New Jersey, New York, Connecticut, Massachusetts, Vermont, New Hampshire, and Maine. The path is maintained by 31 trail clubs and multiple partnerships, and managed by the National Park Service and the nonprofit Appalachian Trail Conservancy. The majority of the trail is in wilderness, although some portions traverse towns, roads and cross rivers.

The Appalachian Trail is famous for its many hikers, some of whom, called thru-hikers, attempt to hike it in its entirety in a single season. Others have managed to perform a “round-trip” of the trail where they thru-hike from one end to the other and then turn around to thru-hike the trail the other way, otherwise known as a “yo-yo.” Many books, memoirs, web sites and fan organizations are dedicated to this pursuit.

An unofficial extension known as the International Appalachian Trail continues north into Canada and to the end of the range, where it enters the Atlantic Ocean. Other unofficial extensions head south into Florida, creating what is known as the Eastern Continental Trail.