Tags: Cave.

The Sandy Glacier Caves are a system of glacier caves within the ice of Sandy Glacier on Mount Hood Oregon. They are thought to be the largest glacier caves in the lower 48 states of the U.S.A. Surveys done in 2011 and 2012 have measured the system at over 1 mile in length. The caves formed from internal glacial melting. As melting continues the caves grow larger with entrances to the caves receding up the glacier’s slope.

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