The Appalachian National Scenic Trail, often called the Appalachian Trail or the A.T., is a hiking trail in the eastern United States. The trail goes between Springer Mountain in Georgia and Mount Katahdin in Maine. The trail is about long. The exact length changes over time as parts are changed. The Appalachian Trail Conservancy says the Appalachian Trail is the longest hiking-only trail in the world. More than 2 million people hike on part of the trail at least once each year.