Multipurpose dam constructed at the confluence point of the Kawauchikawa River, the Kurokuragawa River, and the Yozukugawa River flowing through the Tanzawa Mountains. Surrounded by nature, it has attractions for each season, such as cherry blossoms in the spring and colorful leaves in the fall. The view of Mt. Fuji from the Chiyosawa Park observation deck is especially beautiful, it has been selected as one of the hundred best views of Mt. Fuji in the Kanto region.