The Appalachian National Scenic Trail is a continuous marked footpath extending more than 2,175 miles across the Appalachian Mountains from the summit of Mount Katahdin in Maine to the summit of Springer Mountain in Georgia. It forms a greenway that connects more than 75 public land areas in 14 states. The AT was conceived in 1921, completed in 1937, and established as the first National Scenic Trail by Congress with the passage of the National Trails System Act in 1968.