Mount Maclure is one of Yosemite National Park’s highest peaks, standing in the Cathedral Range near Mount Lyell at the boundary of Madera and Tuolumne counties, where the park meets the Ansel Adams Wilderness. Named for William Maclure, a pioneer of American geology who created the first geological maps of the United States, the mountain carries both geographic and scientific significance. Its northern flank holds Maclure Glacier, regarded as one of Yosemite’s last remaining glaciers. A standard route to the summit leaves the John Muir Trail south of Tuolumne Meadows and crosses the glacier, making the peak a notable destination in Yosemite’s high country.