13.1 mile course traverses the Forks of the River Wildlife Area, William Hastie Park, Marie Myers Park, Ross Marble Quarry, Ijams Nature Center, and other haunts of the beautiful Urban Wilderness of South Knoxville. A mix of rocky, technical singletrack and buffed out, flowing mountain bike trail. Course has a 4 hour time limit. 10k course will utilize some of the main nature center trails as well as those in Meads Quarry. Kids will run their own trail mile in the woods at 8:30 a.m. Details and registration online.