The Appalachian National Scenic Trail (AT) is a passive recreation footpath that runs 2175 miles from Springer Mountain in Georgia to Mount Katahdin in Maine. Ninety miles of this long-distance trail are in Massachusetts, running along the ridges and traversing the valleys of Berkshire County. Conceived in 1921 by Massachusetts native Benton McKaye, the AT was designed to provide a continuous green corridor along the ridge of the Appalachian chain of mountains and hills.