SALT is a 350ish mile circuit created by Matt Kirk using the Appalachian Trail, Bartram Trail, Chatooga River Trail, Foothills Trail, Palmetto Trail, Art Loeb Trail and the Mountains-to-Sea Trail along with a few connecting trails/ roads through Brevard. The loop is complete except for a short section from the Palmetto Trail to DuPont State Park. Land was recently acquired by DuPont to connect the circuit but is in the beginning stages of building the trail. Here is a write up from Blue Ridge Outdoors Magazine:

A 191 mile route circumnavigating the UK's first national park. A combination of rugged Pennine moorland and more gentle farmland. The Peak District National Park was inspired by the Kinder Mass Trespass in 1932, which helped open up the British countryside to the common man. The Peak District sits between the major metropolitan areas of Manchester, Sheffield and Derby. Despite being so close to these urban areas, this National Park includes some of the most beautiful countryside in England.

The Appalachian Trail travels 90 miles in Massachusetts as the trail winds through the Berkshires. The trail passes over the highest point in the state at Mount Greylock with an elevation of 3491 feet. The trail travels over hills, valleys and through towns and hamlets of the Berkshires. The AT passes through the towns of Dalton and Cheshire.