There's no question the Barkley Marathons is one tough race. Participants line up at the start of the Barkley Marathons in the wilds of Tennessee. Although more than a few runners have developed serious medical issues during this race, due to its massive strain on the body's thermoregulation and gastrointestinal systems, it always attracts plenty of entrants for its 100 coveted spots. Crew members keep them wet as a cooling mechanism, frequently spraying them with water, while the runners try to step only on the road's white painted markings, as the blacktop melts shoes. To combat such intense heat, participants typically dress in white, some opting for a full-coverage outfit. Some of the hottest temperatures on Earth have been recorded here, and it's not unusual for runners to face temperatures around 120 degrees Fahrenheit (48.9 degrees Celsius) during the July event. The starting line in Death Valley's Badwater Basin is the lowest elevation in North America at 282 feet (86 meters) below sea level. The course takes runners over three mountain ranges and features a searing 13,000-foot (3,962-meter) vertical ascent. Whitney trailhead, at elevation 8,374 feet (13,477 meters).
David McNew/Getty Imagesīadwater, which began in 1987, is a 135-mile (217-kilometer) trek from California's Death Valley to the Mt. The Badwater is billed as the toughest footrace in the world. Runners pass a heat danger warning sign during the Badwater 135 ultramarathon race in Death Valley National Park, California.
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