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The Deserts of California have unique ecosystems and habitats, a sociocultural and historical "Old West" collection of legends, districts, and communities, and they also form a popular tourism region of dramatic natural features and recreational development. All of the deserts are located in eastern Southern California, in the Western United States.
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There are three main deserts in California: the Mojave Desert, the Colorado Desert, and the Great Basin desert. The Mojave Desert is bounded by the Tehachapi Mountains on the northwest, the San Gabriel and San Bernardino Mountains on the south, and extends eastward to California's borders with Arizona and Nevada; it also forms portions of northwest Arizona. The Colorado Desert lies in the southeastern corner of the state, between the Colorado River and the Transverse Ranges, and continues into Mexico and Arizona to the south and east, (as the named Sonoran Desert). The Great Basin desert lies immediately to the east of the Sierra Nevada cordillera and extends eastward into the state of Nevada.
The deserts encompass all of Imperial County, the southern and eastern portion of Inyo County, the eastern portions of Mono County, Los Angeles County, Kern County, San Diego County, and Riverside County, and most of northern and eastern San Bernardino County. The major urban populations of western San Diego County, Orange County, the Inland Empire, and Greater Los Angeles are over the high mountains toward the Pacific Ocean.
The topographical boundaries include the Tehachapi Mountains to the northwest, together with the San Gabriel and San Bernardino mountain ranges to the south. The mountain boundaries are quite distinct since they are outlined by the two largest faults in California – the San Andreas Fault and the Garlock Fault. The Mojave Desert in California includes the colloquially-defined High Desert region. The Great Basin shrub steppe lies to the north of the Mojave Desert; the warmer Sonoran Desert and its subregion the Colorado Desert lie to the south and east.
The Colorado Desert is a northwesterly part of the larger Sonoran Desert, which extends across southwest North America. The Colorado Desert region encompasses approximately 7 million acres (2,800,000 ha), reaching from the Northwest Mexico border region in the south to the higher-elevation Mojave Desert in the north and from the Colorado River in the east to the Laguna Mountains of the Peninsular Ranges in the west. The area includes the heavily irrigated Coachella, Palo Verde, and Imperial Valleys. The Sonoran/Colorado Desert in California includes the colloquially-defined Low Desert region.
The Great Basin Desert is the only "cold" desert in the country, where most precipitation falls in the form of snow. The Great Basin Desert exists because of the "rainshadow effect" created by the Sierra Nevada of eastern California. When prevailing winds from the Pacific Ocean rise to go over the Sierra, the air cools and loses most of its moisture as rain. By the time the winds cross over the mountains and sweep down the far side, they are very dry and absorb moisture from the surrounding area. This drying effect is responsible for creating the Great Basin Desert.
All of the deserts of California are characterized by low rainfall, caused by the rain shadow of mountain ranges to the west of each desert. The Mojave Desert receives between 3 to 10 inches (76 to 250 mm) of rain per year, while the Colorado Desert receives between 2 to 6 inches (51 to 150 mm).
The Mojave Desert is considered a high desert, because elevations can range up to 11,000 feet (3,400 m). The Mojave Desert is characterized by the presence of Yucca brevifolia, the Joshua Tree, which as an indicator species of the Mojave Desert, extends southeasterly into Mohave County, Arizona, and even further, all parts of northwest Arizona. Other common plants of the Mojave Desert include creosote bush, blackbrush, greasewood[disambiguation needed] and saltbush. Higher elevations host Western juniper and Pinyon pine.
The Colorado Desert is a low desert, with elevations running from -230 to 1,000 feet (−70 to 300 m) above sea level. The Colorado Desert hosts saguaro cactus, Sonoran creosote bush, and Salton Sea saltbush.
The Great Basin desert in California can also reach up to 11,000 feet (3,400 m) of elevation. Plants in the Great Basin Desert are well adapted to the harsh conditions. These plants include Big sagebrush, Pinyon pine, Utah juniper, Low sagebrush, Shadscale, and Bristlecone pine. Sagebrush, a very common resident of the Great Basin, is well adapted to the area. The Big sagebrush root system can extend as much as 90 feet in circumference. This adaptation allows the plant to catch as much water as possible when the rains do come. Mormon tea possesses modified leaves. The leaves are very small and are not the primary area for photosynthesis. The chlorophyll filled stems carry out the primary photosynthesis. Four-wing saltbush excretes salt through its leaves to prevent build-up of lethal salts in the plant. The plants on the alkaline flats have a high internal concentration of salt and are able to extract water other plants can not.
Common animals of the California deserts include the desert bighorn sheep, desert kit fox, coyote, spotted skunk, spotted bat, black-tailed jackrabbit, ground squirrels, kangaroo rat, white-footed mouse, and desert tortoise.
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In 1994, the California Desert Protection Act protected millions of acres within the Death Valley and Joshua Tree National Parks and the Mojave National Preserve. Within these parks and preserves, visitors can view unique landscapes, plants, and animals. Badwater Basin, the lowest point in the United States lies within Death Valley National Park.