Answer: USA
Notes: In the harsh environment of Death Valley, 97 runners recently embarked on the Badwater 135, a 48-hour ultramarathon renowned as the world's toughest foot race. Death Valley, located in southeastern California, USA is the lowest, hottest, and driest part of North America, spanning 7,800 sq. km, with about 1,425 sq. km below sea level. This rift valley, formed by the sinking of rock between major faulted mountains, is part of Death Valley National Park and the Mojave and Colorado Deserts Biosphere Reserve. It is bordered by the Grapevine, Funeral, and Black Mountains to the east, and the Panamint and Cottonwood Mountains to the west.
