Sonoran Desert


Sonoran Desert
Arid region, western North America.

Covering 120,000 sq mi (310,000 sq km), the Sonoran Desert is located in southwestern Arizona and southeastern California, U.S., and northern Baja California and western Sonora state, Mex. The desert's subdivisions include the Colorado and Yuma deserts. Irrigation has produced many fertile agricultural areas, notably the Coachella and Imperial valleys. Warm winters in the Sonoran Desert attract tourists to resorts such as Palm Springs, Tucson, and Phoenix. Indian reservations (see Papago; Pima) are located there.

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also called  Desierto de Altar 

      arid region covering 120,000 square miles (310,800 square km) in southwestern Arizona and southeastern California, U.S., and including much of the Mexican state of Baja California and the western half of the state of Sonora. Subdivisions of the hot, dry region include the Colorado (Colorado Desert) and Yuma (Yuma Desert) deserts.

 The Sonoran Desert has a subtropical climate and receives 3 to 15 inches (75 to 380 mm) of rain per year. Most of it falls during the monsoon season (July–September), when strong, brief thunderstorms bring heavy rain. Lighter winter rainfall occurs in December and January. Frosts are rare. The hottest and driest part of the desert is near the lower Colorado River, where summer temperatures can reach more than 120 °F (49 °C) and rainfall is less than three inches.

 The vegetation of the Sonoran is the most diverse of all the North American deserts. In addition to the saguaro cactus, the signature plant of the desert, common types include the barrel cactus, organ-pipe cactus, prickly pear, cholla, ocotillo, yucca, century plant, ironwood, palo verde, elephant tree, mesquite, and creosote bush; endemic to Baja California are the cardon (up to 60 feet [18 metres] in height, a relative of the saguaro) and the unusual boojum tree (known in Mexico as the cirio). Thorn forest occurs in southern Baja and Sonora. Higher elevations support trees adapted to more-temperate climates. Desert bighorn sheep, mule deer, collared peccaries (commonly known as javelinas), mountain lions, gray foxes, and coyotes make their homes in the desert. Other typical residents include desert tortoises, Gila monsters, tarantulas, scorpions, and a variety of lizards and snakes. Rabbits and rodents, such as jackrabbits and kangaroo rats, are abundant, as are several species of bats. Birds include roadrunners, Gila woodpeckers, Gambel's quail, and a variety of owls and hawks.

      Peoples of the Hohokam culture were early inhabitants of the desert. Spanish explorers and missionaries visited in the 16th and 17th centuries, and missions and settlements often conflicted with local American Indian tribes during the 18th century. Ranching and mining began in the 19th century. Military facilities opened during World War II. Tribes such as the Tohono O'odham (Papago (Tohono O'odham)), Yaqui, Pima, and several Yuman peoples hold reservations throughout the desert.

      Irrigation has produced many fertile agricultural areas, notably the Coachella (Coachella Valley) and Imperial (Imperial Valley) valleys at either end of the Salton Sea. The population of the Sonoran Desert is rapidly growing; during the last decades of the 20th century the region became a major retirement and resort spot. Arizona's largest cities ( Phoenix and Tucson) are located there, and Palm Springs, Calif., is on its northwestern edge.

 The Sonoran Desert has several areas of public land, including Organ Pipe Cactus National Monument and Cabeza Prieta National Wildlife Refuge on the Mexican border, Saguaro National Park near Tucson, Casa Grande Ruins National Monument southeast of Phoenix, and part of Joshua Tree National Park in California. El Pinacate y Gran Desierto de Altar, a biosphere reserve in Sonora on the U.S. border, is an area of lava fields, cinder cones, and volcanic craters. Sonoran Desert National Monument, established in 2001, preserves 760 square miles (1,970 square km) southwest of Phoenix. Within its borders are three mountain ranges, wide valleys, and saguaro forests. The endangered Sonoran pronghorn makes its home there, as do more than 200 species of birds. Hohokam archaeological sites are scattered throughout. Juan Bautista de Anza National Historic Trail passes through the monument.
 

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Universalium. 2010.

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