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.  The neighboring Honen’ike Water Park has a large grass area, and there are points where you can see the powerful dam.