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There are three main deserts in California: the Mojave Desert, the Colorado Desert, and the Great Basin Desert. [5]: 408 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.
In the United States, the EPA and the United States Geological Survey (USGS) are the principal federal agencies working with the CEC to define and map ecoregions. Ecoregions may be identified by similarities in geology , physiography , vegetation , climate , soils , land use , wildlife distributions, and hydrology .
The Mojave Desert is the hottest desert in North America, located primarily in southeastern California and Southern Nevada. Its total area is 22,000 sq mi (57,000 km 2 ). The largest cold desert is the Great Basin Desert , which encompasses much of the northern Basin and Range Province , north of the Mojave Desert.
The Algodones Dunes. The Colorado Desert is a subregion of the larger Sonoran Desert, [1] covering about 7 million acres (2.8 million ha; 28,000 km 2). [2] The desert occupies Imperial County, parts of San Diego and Riverside counties, and a small part of San Bernardino County in California, United States, [3] as well as the northern part of Mexicali Municipality in Baja California, Mexico.
The Lower Colorado River Valley is in the western part of the Sonoran Desert, which is called the Colorado Desert. the Sonoran Desert region proper extends from areas west of the river, and then southeastwards to southeast Arizona, south along the eastern side of the Baja Peninsula cordillera to Baja California Sur, and southeast Sonora state ...
The dry cold Great Basin desert of California consists of the Owens Valley, and is classified into Great Basin shrub steppe by the WWF, [4] and into the Central Basin and Range ecoregion by the EPA. [5] The deserts in California receive between 2 and 10 inches (51 and 254 mm) of rain per year. [6]
California comes in a close second with 13 ecoregions across four biomes in the same realm. By contrast, Rhode Island is the least biodiverse with just one ecoregion—the Northeastern coastal forests —encompassing the entire state.
In the 21st century, the Sandhills are a productive cattle ranching area, supporting over 530,000 beef cattle. [citation needed] The human population of the region continues to decline as older generations die out, younger generations move to the cities, and ranches are consolidated. [11] A number of small towns remain in the region. [citation ...