Dec 18, 2017 · In general, it encompasses nearly 200 million acres (809 million hectares), extending from south of Albuquerque, New Mexico, to the vicinity of Mexico City, including most of the states of Chihuahua, Coahuila, Durango, Zaecas, and San Luis Potosi, as well as large parts of New Mexico, the TransPecos region of Texas, and the southeast corner ...