Of the Pecos Valley, and in the Staked Plain and Edwards Plateau; and the widely extending Lower Austral zone, covering most of the state and subdivided into the Lower Sonoran or arid western part, the Austroriparian, or humid eastern, and the narrow Gulf Strip, which is semi-tropical.
Flanks of the range, with ridges and valleys formed on their eroded edges and drained southward by the Pecos river to the Rio Grande and the Gulf of Mexico.
The stream next in importance is the Pecos river, which rises in Mora county and flows southward into Texas, where it joins the Rio Grande.
A little cotton has been grown near Carlsbad in the Pecos Valley, and in 1909 sugar beets were introduced south of Albuquerque and cantaloupes in the southern Rio Grande Valley.
The Llano is separated from the plains on the north by the mature consequent valley of the Canadian river, and from the mountains on the west by the broad and probably mature valley of the Pecos river.
Other systems contemplated by the government were the Las Vegas project for reclaiming 10,000 acres near Las Vegas, the Urton Lake project for reclaiming 60,000 acres in the Pecos Valley, and the La Plata Valley project for irrigating about 40,000 acres in the northwestern part of New Mexico, 35 m.