Mount Tyndall, a 14,025-foot summit in California’s Sierra Nevada near Mount Whitney and Mount Williamson, is among the state’s highest peaks and stands on the divide separating Sequoia National Park from the John Muir Wilderness and Inyo National Forest, as well as Inyo and Tulare counties. Named for Irish scientist and mountaineer John Tyndall, it is most notable historically for the July 6, 1864, ascent by Clarence King and Richard Cotter of the California Geological Survey. After approaching from Kings Canyon, they believed they had reached Mount Whitney, only learning months later that they had climbed Mount Tyndall instead.