This enormous dam is located in the mountains of western Kagawa Prefecture, and has a length of 145.5 meters and height of 30.4 meters. This dam dates to the beginnings of Japanese dam building, and has a multi-arch construction (the dam wall has multiple joined arches). It is also designated as a National Important Cultural Heritage. Building began in 1926, and after a long and arduous period of construction, it was final finished in the form you see today, reminiscent of a medieval European castle. The dam blends well with the natural surroundings, and you can see the seasonal beauty reflected in the water and adjacent areas.