Global Volcanism Program | Image GVP-02802
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.