Kurilskoye is a crater lake in the south of the Kamchatka Peninsula on the territory of the South Kamchatka Federal Reserve. The reservoir is surrounded by rocky shores and impenetrable thickets of shrubs. By and large, in terms of size, this giant can only yield to Kronotsky, giving him the palm. Of the freshwater lakes of Kamchatka, Kurilskoe is the second largest (area 12.5 x 8 km).