Ksudach Volcano Caldera, Kamchatka, Russia

Ksudach (Russian: Ксудач) is a stratovolcano in southern Kamchatka, Russia. The last eruption of Ksudach was in 1907, which was one of the largest ever recorded in Kamchatka. The summit area comprises overlapping calderas. Two lakes, Balshoe and Kraternoe, are located within calderas at the summit of Ksudach.https://en.wikipedia.org/wiki/Ksudach