Big Bend National Park is an American national park located in West Texas, bordering Mexico. The park has national significance as the largest protected area of Chihuahuan Desert typography and ecology in the United States, and was named after a large bend in the Rio Grande/Rio Bravo. Encompassing an area of 801,163 acres, entirely within Brewster County. The park protects more than 1,200 species of plants, over 450 species of birds, 56 species of reptiles, and 75 species of mammals. The area was established as a national park on June 12, 1944.