The Blue Ridge Parkway is a National Parkway and All-American Road in the United States, noted for its scenic beauty. It runs for 469 miles (755 km), mostly through the famous Blue Ridge, a major mountain chain that is part of the Appalachian Mountains. Land on either side of the road is maintained by the National Park Service. It is the longest, narrowest National Park in the world and is the most visited unit in the United States National Park System.