12hr Winter ultramarathons in Tennessee, United States

1.1-mile loop with 340 feet of climbing per lap, steep ascents, runnable sections, and a field descent on double track logging road

Rugged forested loops on Whitwell Mountain with 1000 feet of elevation gain per circuit, diverse terrain, bluffs, waterfalls, and scenic vistas

Rugged 5-mile trail loop at Hardin Farm, with about 1,000 feet of climbing per lap on repeatedly hilly terrain.