Mount Rainier is a composite volcano in Pierce County, Washington, located 54 miles (87 km) southeast of Seattle, Washington, in the United States.

It is the highest peak in the Cascade Range, with a topographical summit of 14,411 feet (4,392 m).

The mountain and the surrounding area comprise Mount Rainier National Park.

The mountain is mostly covered by snow and glaciers, but heat from the volcano keeps areas of the crater rim on its summit cone mostly free of snow and ice.

The geothermal heat has also caused the formation of glacier caves in the twin summit craters..

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