Skillern Hot Springs is one of the finest backcountry soaks in the Smoky Mountains: a solid rock-walled, waterfall-fed pool with a log dam, reached by a roughly 2-hour hike in the Sawtooth National Forest in the Fairfield/Featherville area. Crystal-clear water at 100–106°F, a trailhead campground, and seasonal riverside pools below make it worth every step.