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The Teton Range is a mountain range of the Rocky Mountains in North America. It extends for approximately 40 miles (64 km) in a north–south direction through the U.S. state of Wyoming, east of the Idaho state line. It is south of Yellowstone National Park, and most of the east side of the range is within Grand Teton National Park. One theory says the early French voyageurs named the range les trois tétons after the breast-like shapes of its peaks. Another theory says the range is named for the Teton Sioux, also known as the Lakota people. It is likely that the local Shoshone people once called the whole range Teewinot, meaning "many pinnacles". The principal summits of the central massif, sometimes referred to as the Cathedral Group, are Grand Teton, Mount Owen, Teewinot, Middle Teton and South Teton. Other peaks in the range include Mount Moran, Mount Wister, Buck Mountain and Static Peak.