Great Smoky Mountains National Park is made up of countless forested mountain ridges that form the border between Tennessee and North Carolina. Encompassing over 800 square miles in the southern Appalachian Mountains, this one of America's most visited national parks, and for good reason! The park is famous for its stunning variety of flora and fauna, the magnificence of its ancient topography, and the remnants of its Southern Appalachian culture. Visitors are sure to be impressed by the wonderful diversity that the park has to offer. Find a trail with the MTB Project.