Big Bend National Park is a United States National Park located in the westernmost part of Texas, on the border with Mexico. The park protects more than 1,200 square miles of desert and mountains, along with the Rio Grande River, which forms the border with Mexico. Big Bend National Park is home to a diverse array of wildlife, including mountain lions, black bears, javelina, roadrunners, and more than 450 species of birds. The park also contains a variety of geological formations, including the Chisos Mountains and the Santa Elena Canyon. Activities in the park include hiking, camping, fishing, horseback riding, and backpacking.