Which desert covers the Big Bend region of Texas and northern Mexico?

The desert covering the Big Bend region of Texas and northern Mexico is the Chihuahuan Desert.

It is a large desert ecoregion extending across northern and central Mexico and parts of the southwestern United States. In Texas, it occupies much of the Trans-Pecos, including Big Bend National Park and the Rio Grande corridor. Across the river, related Chihuahuan Desert landscapes continue into the Mexican states of Chihuahua and Coahuila.

The region is not simply a landscape of bare sand. Much of the Chihuahuan Desert consists of shrublands, grasslands, mountain ranges, canyons and river valleys. Its elevation and summer monsoon rains distinguish it from the hotter, lower Colorado and Sonoran desert areas farther west. Big Bend is especially notable for the sharp contrast between desert lowlands and the cooler, forested Chisos Mountains.