Malpai Borderlands is a region, or areal feature, along the U.S.-Mexico border at the Arizona and New Mexico state line. It encompasses the extreme southeast corner of Arizona and the southwest corner of New Mexico describe the general vicinity. It includes areas inside the U.S. states of Arizona and New Mexico as well as the Mexican states of Chihuahua and Sonora. The name "Malpai", relates to a type of "desert pavement", formed by wind (eolian) processes, and is called Malapai.