Death Valley is the lowest, driest and hottest valley in the United States. It is the location of the lowest elevation in North America at 85.5 m (282 ft) below sea level. It holds the record for the highest reliably reported temperature in the Western hemisphere (134 °F (56.7 °C) at Furnace Creek in 1913, as discussed below) - just short of the world's highest, which was 136 F (58 C) in El Aziza, Libya on Sept. 13, 1922. Located southeast of the Sierra Nevada range in the Great Basin and the Mojave Desert, it constitutes much of Death Valley National Park. It is mostly located in Inyo County, California. It runs north-south between the Amargosa Range to the east and the Panamint Range to the west; the Sylvania Mountains and the Owlshead Mountains form its northern and southern boundaries, respectively. It has an area of about 3,000 square miles (~7,800 km²).

Geography

Geologically, Death Valley is considered one of the best examples of the Basin and Range configuration. It lies at the southern end of a geological trough known as the Walker Lane which runs north into Oregon. The valley is bisected by a right lateral strike slip fault system, represented by the Death Valley Fault and the Furnace Creek Fault. The eastern end of the left lateral Garlock Fault intersects the Death Valley Fault. Located on the border of California and Nevada, Death Valley is the principal feature of the Mojave and Colorado Deserts Biosphere Reserve. Death valley also contains salt pans. According to current geological consensus, during the middle of the Pleistocene era there was a succession of inland seas (collectively referred to as Lake Manly) located over where Death Valley is today, but as the area turned to desert the water evaporated, leaving behind the abundance of evaporitic salts such as common sodium salt and borax, which were subsequently exploited in the early portion of the modern history of the region (1883 to 1907 - see http://www.science.smith.edu/departments/Geology/dv/Boron/home.html#History). After the most prolific rainy seasons, a temporary lake has been known to form at Badwater; when this occurs, non-motorized watercraft are allowed by the National Park Service. (However, motorized watercraft are not allowed as it is a designated wilderness area.) Fact: date=March 2008

Temperatures in the Valley can range from up to 130 °F (54 °C) in the day in the summer, to below freezing at night in the winter. The lowest temperature on record at Furnace Creek Inn is 15 °F (-9 °C). The National Climatic Center reports that temperatures at Furnace Creek reach 90 °F (32 °C) on an average of 189.3 days annually and 100 °F (38 °C) on an average of 138.0 days annually. Freezing temperatures occur on an average of 11.7 days each year.