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a physiographic province of the Intermontane Plateaus region, extending across the southwestern United States and covering the southeastern half of Utah, extreme western and southwestern Colorado, northwestern New Mexico, and the northern half of Arizona. The province, which occupies about 130,000 square miles (337,000 square km), is bounded by the Rocky Mountains (north and east), the Great Basin (west), and the Sonoran Desert (south). The plateau is dominated by high mountains that are gashed by river canyons or scarred with dry gullies and washes and the beds of intermittent streams. Other topographic features include great shallow basins, sunken deserts, picturesque buttes and mesas, and rare verdant sections of valley. Elevations range from 2,000 feet (600 m) in the Grand Canyon, Arizona, to more than 12,700 feet (3,870 m) in the La Sal Mountains, Utah. Erosion by the Colorado River system has carved deep, brilliantly coloured gorges, notably the Grand Canyon. (The erosive power of the river is shown in the .) The province embraces numerous conservation areas and also many Indian reservations