1st Edition 2021. TR Trail Guides. There are nearly 800 miles of hiking trails in the Great Smoky Mountains National Park of North Carolina and Tennessee. This guidebook gives detailed descriptions to all of them including driving directions to trailheads, campsites, water and points of interest. Mileages are given in both directions for all the trails. Measures at 4.5 by 6.5 inches, small enough for your pack or your pocket.