A dramatic 750-m-wide crater filled with a salt-water lake truncates the summit of Kasatochi volcano. Steep-sided crater walls rise to a maximum elevation of 314 m above the lake surface, which is less than 60 m above sea level. The volcano is located at the northern end of a shallow submarine ridge trending perpendicular to the Aleutian arc and occupies a small 2.7 x 3.3 km wide island volcano. Reports of activity from the heavily eroded Koniuji volcano to the east probably refer to eruptions from Kasatochi. Photo by Dan Rogers, 1961 (courtesy of Alaska Volcano Observatory, U.S. Geological Survey).