California, United States
Mammoth Mountain is a large lava dome complex that lies to the west of the town of Mammoth Lakes, California in the Inyo National Forest. It is home to a large ski area.
Mammoth Mountain was formed in a series of eruptions that ended 57,000 years ago. However, Mammoth still produces hazardous volcanic gases that kill trees and have caused ski patroller fatalities.
Mammoth Mountain is home to the Mammoth Mountain Ski Area, the tallest ski resort in California. Mammoth Mountain is notable in that it gets an unusually large amount of snow, about 400" annually, compared to other Eastern Sierra peaks, due to Mammoth Mountain lying in a low gap in the Sierra crest. In the summer months the ski gondolas are used by mountain bikers and tourists who wish to get a summit view of Long Valley Caldera directly to the east and Sierra peaks to the west, south and north.