Chiso Mountains Overlook – Chiso Mountains Overlook in Big Bend National Park. This is one of those awesome views you get when you first drive into Big Bend National Park but timing is crucial to get a good shot from here. Finally we had all the right elements to capture the Chiso mountain range from this area. We have come through many times when the light is not good for a shot but today it worked. After a short hike I was able to find this wonderful prickly pear to help frame my photo so I was more than happy with the results. The Chiso mountains was formed by a volcanic event millions of years ago and in this image you can see the V or window as it is called with a view into the basin. 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 topography and ecology in the United States. The park was named after a large bend in the river, and the Texas—Chihuahuan Desert is part of Big Bend and includes northern Mexico and the southwestern United States. Chiso 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 mainland United States. The highest point in the Chisos Mountain range is Emory Peak at 7,825 ft above sea level.