The Cumberland Gap National Historical Park is a United States National Historical Park located at the border between Kentucky, Tennessee, and Virginia, centered on the Cumberland Gap, a natural break in the Appalachian Mountains. The park lies in parts of Bell and Harlan counties in Kentucky, Claiborne County in Tennessee, and Lee County in Virginia. The park contains the Kentucky-Virginia-Tennessee tripoint, accessible via trail. The town of Cumberland Gap, Tennessee is located inside of the park's territory. The Cumberland Gap Visitor Center is located on U.S. Highway 25E just southeast of the city of Middlesboro, Kentucky, and just northwest of the Cumberland Gap Tunnel and the town of Cumberland Gap, Tennessee. The visitor center features a museum with interactive exhibits about the Gap's role as a transportation corridor, an auditorium that shows films about the area's cultural and natural history, a book store and the Cumberland Crafts gift shop with crafts from Appalachia. Physical geography The park covers and is among the largest national parks in the eastern United States. As of 2010, of this was designated as Recommended Wilderness. Elevation varies from a low of to a high of . The park runs along the Cumberland Mountains, stretching about with an average width of . The park straddles a tri-state area encompassing land from Kentucky, Tennessee and Virginia. It includes the area of the Wilderness Road running through the passage across the Cumberland Plateau and through the Cumberland Gap, an important geological feature that facilitated travel for American settlers and Native Americans. It includes 24 known cave features ranging in size from around to more than in length. There are a number of large cliff systems in the park, the most prominent of which is the cliffs of White Rocks, located in the eastern portion of the area. At the northeastern end, the park sits adjacent to the Sillalah Creek Wildlife Management Area and the Martin's Fork Wildlife Management Area and State Natural Area. The climate of the area is mild, with hot and humid summers and mild winters, and an average annual temperature of . Hydrology The park contains over of streams. With the exception of one, Little Yellow Creek, all of these originate from within the park, with those to the north of the main ridge flowing into the Cumberland River, and those to the south flowing into the Powell River. Overall water quality in the park