The Guadalupe Mountains are a mountain range located in West Texas and southeastern New Mexico. The range includes the highest summit in Texas, Guadalupe Peak, 8,751 ft (2,667 m), and the "signature peak" of West Texas, El Capitan, both of which are located within Guadalupe Mountains National Park. The Guadalupe Mountains are bordered by the Pecos River valley and Llano Estacado to the east and north, Delaware Mountains to the south, and Sacramento Mountains to the west. One of the clearest exposures of a prehistoric reef is preserved in the mountain range's bedrock geology. Bedrock contains fossils of reef-dwelling organisms from the Permian period, and the geology is widely studied, mostly by stratigraphers, paleontologists, and Paleoecologists.

Guadalupe Peak, also known as Signal Peak, is the highest natural point in Texas, with an elevation of 8,751 feet (2,667 m) above sea level. It is located in Guadalupe Mountains National Park, and is part of the Guadalupe Mountains range in southeastern New Mexico and West Texas. The mountain is about 90 miles (140 km) east of El Paso and about 50 miles (80 km) southwest of Carlsbad, New Mexico. The peak rises more than 3,000 feet (910 m) above the arid floor of the Chihuahuan Desert.