About Ura-Mashu Viewpoint Ura-Mashu Viewpoint is located in North-East side of Lake Mashu at Ura-Mashu Viewpoint which is at the middle of Kiyosato-cho and nakashibetsu-cho. Lake Mashu has 3 viewpoints of Mashu Viewpoint 1, Mashu Viewpoint 3 and Ura-Mashu Viewpoint. Because you can see rocky side of Mt.Mshu