Piyashiri Marsh is Japan’s northernmost high moor, 4 km to the direction of Oumu-cho from the summit of Mt. Piyashiri, one of Japan’s 100 Fine Mountains. This marsh land with an area of 38,000 square meters is located at an altitude of 920 m above sea level. Here, a variety of wildlife add mystique to the landscape. On the forest floor of Yezo spruce, the community of alpine plants such as sundew, hare's tail cotton grass, and moorwort looks like a carpet of flowers. In this truly unexplored land, there are three large and small ponds, where Ezo brown frogs and Ezo blue dragonflies are resting in a leisurely way. As the area is also a habitat of brown bears and other wild animals, you can’t go into this marsh land with an easy going thought, which might have enabled beautiful nature to remain intact.