Lake Toyako, which is situated in the southwestern part of Hokkaido, belongs to Shikotsu-Toya National Park. This caldera lake lies 11km east and west, 9km south and north and measuring 43km around. The active volcano that stands proudly near the lake with white smoke rising above it is Mt. Usu. It is one of the most active volcanoes, with repeated eruptions on a cycle of between 30 and 50 years. Its most recent eruption was in 2000. Live craters and the remains produced by volcano eruption can be closely observed. It was registered in world Geopark for the first time in Japan in 2010. Lake Toya hot spring, which stretches out along the lake, is one of the best spa resorts in Hokkaido. Various events such as fireworks are held throughout the year. The G8 Hokkaido Toyako Summit was held in 2008. Many people from around the world gathered at Lake Toya. Abundant in nature, it is an excellent place to exchange world view on the global environment and climate change. There are many places of interest around Lake Toya including the Volcano Science Museum where they show visual images of the eruption that occurred in 1977 and 2000, complete with a special sound system.
Lake Toyako is an ice-free lake. It never freezes, even in winter when the temperature falls quite drastically. The beauty of the ice-free lake can therefore be admired anytime during the year. There are big and small four islands called Nakajima in the middle of the lake, and on it is the Toyako Forest Museum, which is a part of the sightseeing boat route. Trout and smelt fishing are very popular sports in and around the lake. There are also fully facilitated camping sites.