is a nearly circular caldera lake in Shiraoi, Hokkaidō, Japan. It is part of Shikotsu-Tōya National Park. The lake is recognized as having the best water quality in all of Japan. With a transparency of , the lake ranks second to Lake Mashū according to the Ministry of the Environment.
Resident species of the lake include a salamander species, . Since 1909, sockeye salmon have been introduced to the lake.
See also List of volcanoes in Japan List of lakes in Japan
References
External links
Kuttara - Japan Meteorological Agency - Japan Meteorological Agency Kuttara-Noboribetsu Volcano Group - Geological Survey of Japan