Lake Kuttara located in a Special Zone of Shikotsu-Toya National Park is a caldera lake with an area of 4.68 sq m and a circumference of 8 km. As there are no rivers flowing into or out of this lake, it contains extremely high quality of water. It tops the list of the lakes and reservoirs in the water quality survey of public water areas conducted by the Ministry of Environment every year. It also boasts the second highest transperancy after Lake Mashu.

The aquaculture of Himemasu (sockeye salmon) has been practiced in this lake since 1909. You can rent a boat to enjoy Himemasu fishing as well as to have a relaxing time, viewing the surrounding thick virgin forest. With few facilities around it, the lake has a tranquil and mysterious atmosphere. If you are lucky, you may have a chance to see an Ezo red fox along the road from Noboribetsu Hot Springs to the western side of the lake.