Lake Mashu is located in a lake in the Kawasaki-cho, Kawakami-gun, in the eastern part of Hokkaido, Japan. It is a volcanic lake and is the most transparent lake in Japan. It was listed as a Hokkaido heritage in 2001. When I went, it was cold, although the cold wind blew my whole person frozen, but it was amazing when I saw the quiet and sacred Lake Mashu. It is said that there is not much time when Lake Mu Zhou can see the whole picture all year round. If you are lucky enough to see the Lake of the Week at the sunny day, this is very lucky~