The Colorado River forms part of the southwest boundary of the
United States.
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Yes, the southwest United States has several deserts.
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Arizona is in the Southwest of the United States in North
America.
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The states considered to be in the US Southwest are as follows:
Arizona, California, Nevada, New Mexico and Utah. These states
account for 16.81% of the total land area of the United States.
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Most deserts are located in the southwest United States.