Mount Whitney (Paiute: Too-man-i-goo-yah) is the tallest mountain in the contiguous United States and the Sierra Nevada, with an elevation of . It is located in East-Central California, on the boundary between California's Inyo and Tulare counties, west-northwest of the lowest point in North America at Badwater Basin in Death Valley National Park at below sea level. The west slope of the mountain is in Sequoia National Park and the summit is the southern terminus of the John Muir Trail which runs from Happy Isles in Yosemite Valley. The east slope is in the Inyo National Forest in Inyo County.