Tsūjun Bridge is an aqueduct in Yamato, Kumamoto, Japan. It is an arch bridge completed in 1854 and is 84.0m long. The arch spans 27.3m. It is the largest stone aqueduct in Japan.
Its purpose was to let water flow into a higher area (Shiroito Plateau) for farming.
In order to keep the aqueducts in a perfect condition, and for viewers such as tourists, water is poured into the river once in a while. It is a great show.