This 59.2-meter-high gravity concrete dam was constructed on the upper reaches of  Katagiri Matasukawa River in the Tenryu River system. Its primary purposes are flood control, maintaining a stable river flow, and securing a reliable supply of water for the public water system. The lakeside is filled with beautiful seasonal nature, from young leaves in spring, deep green in summer, and red leaves in autumn to snow-covered scenery in winter, captivating visitors. Well-maintained walking paths around the lake enable visitors to refresh themselves in nature while admiring the structural beauty of the dam and the tranquil lake surface. It is also a popular spot for bird watching and photography, beloved by locals and tourists alike. This is a soothing spot where you can feel the changing seasons in a quiet and tranquil atmosphere.