Two overlapping craters are at the summit of Mount Rainier. Continued high heat flux has produced fumaroles that have formed ice tunnels in the 100-m-deep icecap filling the eastern summit crater, shown in this 1958 photo. Ice caves are also present in the smaller western crater, which contains a small crater lake beneath the ice.

Photo by Richard Fiske, 1958 (Smithsonian Institution).

This image is made available under the Public Domain Dedication CC0 license, but proper attribution is appreciated.

Keywords: crater

Rainier