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Big Southern Butte
Big southern butte.Par.84344.Image.-1.-1.1.jpg
Big Southern Butte
Highest point
Elevation 7,550 ft (2,300 m)
Prominence 2,380 ft (730 m)
Location Butte County, Idaho,
United States
Topo map USGS Big Southern Butte
Age of rock 300,000 years
Mountain type Lava dome
Designated: 1976

Big Southern Butte is the largest and youngest (300,000 years old) of three rhyolitic domes formed over a million years near the center of the Eastern Snake River Plain in the U.S. state of Idaho. In fact, it is one of the largest volcanic domes on earth. It rises approximately 2500 vertical feet (762 m) above the lava plain in southern Butte County, east of Craters of the Moon National Monument.

Big Southern Butte consists of two coalesced lava domes with a base diameter of 6.5 kilometres (4.0 mi) and a combined volume of approximately 8 cubic kilometres (1.9 cu mi).

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