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The sonoran desert is one of the largest North American deserts, over 120,000 square miles (311,000 square kilometers), occupying the coastal plain and low elevation basins to the north and northeast of the Gulf of California. It comprises a part of Arizona and California in the United States, western Sonora, and the southern two-thirds of the Baja California peninsula in Mexico. The physical features of the isolated mountains and outwash lowland plains place the region within the Basin and Range Province. The Sonoran Desert low to mid elevation mountains range from northwest to southeast in parallel to one another. The highest area, 3,957 feet (1,206 meters) in elevation, is in the western part of the ecoregion. The foothills of the western Sierra Madre Occidental dominate ...

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