Chisos Mountains
The Chisos Mountains, also known as the Chisos, are a mountain range located in the Big Bend area of the Trans-Pecos region of Texas, United States. The mountain system covers 40 square miles (104 square km) and is contained entirely within the boundaries of Big Bend National Park, making it the only mountain range in the United States fully contained within a national park. The Chisos Mountains are the southernmost mountain range in the mainland United States. The Chisos Mountains were created by volcanic activity during the Eocene Epoch 35-44 million years ago. The highest point  in the Chisos Mountain range is Emory Peak at above sea level. Location. The Chisos Mountains are located in Big Bend National Park. The range of mountains extends twenty miles from Punta de la Sierra in the southwest to Panther Junction in the northeast. An extensive trail system and permit-required backcountry campsites are maintained by Big Bend National Park for its visitors. The Northeast Rim and Southeast Rim trails are closed from February 1 through May 31 along with some of the backcountry campsites along these trails to protect the local peregrine falcon population. The mountain area is partly  forested (recovering from logging and overgrazing prior to the area's inclusion in the National Park System in the 1930s), and surrounded by the Chihuahuan Desert. The nearby towns include Study Butte, Terlingua, Fort Stockton, 135 miles north, Alpine, northwest and Presidio, about west. Two Mexican towns (Boquillas and Santa Elena) border the park; and cross-border access was reopened in 2011. Etymology. One of the multiple possibilities of the origin of the name is the option that it stems from "hechizos", a Castilian word meaning "enchantment". Another possibility is the option that the word originated from "chisos", a Native  American word meaning "ghost" or "spirit".