The Colorado Plateau itself is an area where the Colroado River and the streams that flow into it have dug canyons. In New Mexico the Colorado Plateau extends across the northwestern part of the state. The fourth and final province is the basin and range province. It is the state's largest province. It extends across the southwestern, central, and south-central parts of the state.
Basins are broad, dry drainage areas.
Two such basins are the Estancia Basin and the Tularosa Basin. Two other basins are the Plains of San Augustin and the Rio Grande Valley. The mountain ranges in this province are many. The Sandia and Manzano mountains are east of Albuquerque. Between Alamogordo and Roswell is the Sacramento Range.