Such are the Great Salt Lake and Carson deserts in the north, the Mohave and Colorado and Amargosa (Death Valley) deserts of the south-west.
The Mohave desert - embracing Kern, Los Angeles and San Bernardino - as also a large part of San Diego, Imperial and Riverside counties, belong to the " Great Basin," while a narrow strip along the Colorado river is in the " Open Basin Region."
At the two ends of Cajon Pass, only four or five kilometres apart, are the two utterly distinct floras of the Mohave desert and the San Bernardino valley.
More recently, the extensive deposits of borates (chiefly, however, of calcium; see Colemanite) in the Mohave desert on the borders of California and Nevada, and in the Atacama desert in South America, have been the chief commercial sources of boron compounds.