An acidic lake occupies Troitsky crater, the youngest and southernmost crater of Maly Semyachik where historical eruptions have occurred. The conical peak in the distance is Karymsky, 15 km SW, which was constructed within a Holocene caldera.

Photo by Dan Miller, 1990 (U.S. Geological Survey).

Keywords: crater | crater lake | stratovolcano

Karymsky

Maly Semyachik