Grand Teton is the highest mountain in Grand Teton National Park, in Northwest Wyoming, and a classic destination in American mountaineering. Geography Grand Teton, at , is the highest point of the Teton Range, and the second highest peak in the U.S. state of Wyoming after Gannett Peak. The mountain is entirely within the Snake River drainage basin, which it feeds by several local creeks and glaciers. The Teton Range is a subrange of the Rocky Mountains, which extend from northern British Columbia to northern New Mexico. History Name Grand Teton's name was first recorded as Mount Hayden by the Washburn-Langford-Doane Expedition of 1870. However, the name "the Grand Teton" had early currency. The Edition of April, 1901 of the USGS 1:125,000 quadrangle map of the area shows "Grand Teton" as the name of the peak. A United States National Park named "Grand Teton National Park" was established by law in 1929. By 1931, the name Grand Teton Peak was in such common usage that it was recognized by the USGS Board on Geographic Names. Another shift in usage led the Board to shorten the name on maps to Grand Teton in 1970. In terms of etymology for the mountain's naming, the most common explanation is that "Grand Teton" means "large teat" or "large nipple" in French (téton), named by either French-Canadian or Iroquois members of an expedition led by Donald McKenzie of the North West Company. Unsubstantiated claims exist that the mountain was named after the Teton Sioux tribe of Native Americans, even though this tribe lived about 200 miles (320 km) away in the Dakotas, not Wyoming. Moreover, in terms of etymology studies, the Teton Sioux tribe's name is stated as being "not related" to the Grand Teton. First ascent There is a disagreement over who first climbed Grand Teton. Nathaniel P. Langford and James Stevenson claimed to have reached the summit on July 29, 1872. However, some believe their description and sketches match the summit of The Enclosure, a side peak of Grand Teton. The Enclosure is named after a man-made palisade of rocks on its summit, probably constructed by Native Americans. Mountaineer and author Fred Beckey believes that the two climbed the Enclosure because their description better matches it and does not accurately describe the true summit, nor does it mention the formidable difficulties found just above the Upper Saddle. Beckey also believes that they summited