Crystal Crag is a 10,377-foot peak in the Sierra Nevada south of Mammoth Lakes, notable for its steep, dramatic profile above nearby lakes and for its close connection to the alpine basin around it. Rising sharply above Lake George, it drains into Crystal Lake, T J Lake, and Lake George before water continues to Mammoth Creek. Officially named by the United States Board on Geographic Names, the mountain is also a well-known rock climbing destination, with documented ascents on major faces and buttresses from 1936, 1968, and 1973. Its alpine climate, shaped by Pacific storms and orographic lift, helps create the snow, rugged relief, and rock walls that define its character.