Rising from the ground in a seemingly random area is the smoke from an underground fire burning in the coal seams of Smoky Mountain. It is unknown when the fire started or how, but it is here to stay until the fuel has run out. Experts have tried extinguishing the fire, but new seams have opened, showing their failed attempts. These fires burn around 1,000 feet below the mudstone and sandstone known as the Straight Cliffs Formation. Although you can always smell the putrid odor, smoke may only be visible when temperatures are near or below freezing. Please be very cautious when exploring the seams as they are open holes with nauseating fumes that cling to clothing. Any vehicle with adequate ground clearance can drive this trail. Camping is rather limited to a few small, lightly-used sites. Better camping can be found along Smoky Mountain Road.