Mount Mageik (2,165 m [7,103 ft] high) and Mount Martin (1,863 m [6,112 ft] high; on skyline at right) volcanoes, both emitting steam plumes from their summits, as viewed to the southwest from across the Valley of Ten Thousand Smokes, Katmai National Park and Preserve, Alaska. Photograph by R. McGimsey, U.S. Geological Survey, July 15, 1990.
Image courtesy of AVO / U.S. Geological Survey.