The Chihuahuan Desert is a desert, and an ecoregion designation, that straddles the U.S.-Mexico border in the central and northern portions of the Mexican Plateau. It is bordered on the west by the extensive Sierra Madre Occidental range, along with overlaying northern portions of the Sierra Madre Oriental. On the United States side, it occupies much of southwestern Texas and small parts of New Mexico and Arizona. On the Mexican side, it covers the northern half of the state of Chihuahua, along with the majority of Coahuila, north-eastern Durango, the extreme northern part of Zacatecas, and small western portions of Nuevo León. With an area of about , it is the third largest desert of the Western Hemisphere and the second largest in North America, after the Great Basin Desert.
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