A rich, natural habitat, home to a variety of beautiful wetland plants such as ohmizugoke moss, Fringed orchids, Pogonia orchids, Waterlily, Sundrews (carivorous plants) and Cirsium sieboldii (thistles).

In the spring, the wetlands come alive with white waterlilies, and visitors can stroll over the marsh via wooden bridges. There are a few viewpoints, and also waterfalls in the area.

The marshlands are designated as a prefectural natural monument and have an area of 26.7 hectares. The marsh is nestled in the mountains at 600 meters (east, west and north sides). The south side slopes down towards the Matsuo River, at 550 meters above sea level.