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) is a city in San Bernardino County, California, United States. The population was 14,764 at the 2000 census.
According to the United States Census Bureau, the city has a total area of 142.0 km² (54.8 mi²), all land.
The city is in a desert and mountain area. Located there are Joshua Tree National Park and Park Headquarters, and Marine Corps Air Ground Combat Center Twentynine Palms, the world's largest Marine Base. It is located approximately half way between Los Angeles and Las Vegas using Interstates 10 and 15.
Located at an elevation of 1950 feet (595 m) in the Mojave desert of Southern California, Twentynine Palms is recognized for its extreme temperatures. On July 17, 2005, the high temperature hit 119 degrees Fahrenheit (48.3°C), which is a new record for the site. The previous record was 118 degrees Fahrenheit (47.8°C), set on July 11, 1961. The record low temperature is 9 degrees Fahrenheit (-12.2°C), set on December 23, 1990.