The Chisos Mountain are a mountain range located in the Big Bend area of West Texas, USA. The mountain range is contained entirely within the boundaries of Big Bend National Park. This is the only mountain range in the United States to be fully contained within the boundary of a National Park. It is also the southernmost mountain range in the United States. The highest point in the Chisos Mountain range is Emory Peak at 7825' (2,385 m) above sea level. (wikipedia)