Big Bend National Park is located near the city of Alpine, in Brewser County, in the state of Texas, United States. The park protects the largest area of Chihuahuan Desert topography and ecology in the United States. Named after a large bend in the Rio Grande.
As stated in the foundation document:
Big Bend National Park preserves a large area of the Chihuahuan Desert, encompassing spectacular wilderness character, scenic values, natural dark skies, and the biological and geological diversity of the Big Bend area, including the Chisos Mountains and the Rio Grande and its canyons. The park provides for the benefit and recreational enjoyment of the public, with opportunities to experience remoteness and the international flavor of the US-Mexican border, and works cooperatively toward binational management of resources.