The Colorado Plateau is a 130,000 square-mile geological region of the southwestern United States. This area covers the four corners region, as well as most of western Colorado, northwestern New Mexico, northern Arizona and southern/eastern Utah. While the eastern edge of the region is drained by the Rio Grande, the vast majority of the Colorado Plateau is drained by the Colorado River, and is comprised of high desert landscapes with scattered mountain forests.
The southwestern corner of the region is dominated by the Grand Canyon in northern Arizona, which typifies the rugged terrain and dramatic features for which the area is known. Fantastic landscapes full of domes, towers, slot canyons, hoodoos and arches have spurred people to protect huge amounts of land within the Plateau, which is home to a wide variety of National Parks and Monuments. Aside from the Grand Canyon, the most famous of these are in Utah - Bryce Canyon, Zion, Arches and Canyonlands are all considered world class destinations for their breathtaking features set among a desert wilderness backdrop.
Mogollon Rim, Arizona
To the north loom the Rocky Mountains, though the southern Rockies push sporadically south into the Colorado Plateau, extending all the way down to Santa Fe in the majestic form of the Sangre de Cristos. The eastern border is formed by the Rio Grande Rift, which extends all the way from central Colorado clear down into Chihuahua, Mexico. The Plateaus southern edge is defined by the Mogollon Rim, an ancient escarpment that separates the lower lands to the south (4-5,000 ft) from the Plateau's highlands of ~8,000 ft. These stark cliffs of limestone and sandstone form a very visible line of demarcation from the adjoining Basin and Range, a huge geological region that covers the rest of New Mexico and Arizona as well as large portions of northern Mexico, California, Utah and Nevada.
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