Teton Range, a range of the Rocky Mountains in northwestern Wyoming near the Idaho border. To the north is Yellowstone National Park and on the east is Jackson Hole, a mountain valley about 6,000 feet (1,800 m) above sea level. The range, about 40 miles (65 km) long, rises abruptly above the valley floor, creating one of the most impressive mountain landscapes in the United States. The highest peak, Grand Teton (13,770 feet [4,197 m] high), and several others are included in Grand Teton National Park. Since the establishment of the park in 1929, the area has become a popular vacation spot.