Long Valley Caldera

Long Valley Caldera is a depression in eastern California that is adjacent to Mammoth Mountain. The valley is one of the Earth's largest calderas, measuring about 20 mi long, 11 mi wide, and up to 3,000 ft deep.

Location: Mono County, California · United States
Floor elevation: 6,500–8,500 ft (2,000–2,600 m)
Length: 20 mi (32 km) EW
Width: 11 mi (18 km)
Depth: up to 3,000 ft (900 m)
Age: 760,000 yrs
Type: Caldera

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Data from: en.wikipedia.org