is a Taishà Â-era stone bridge over the Yamakuni River in Yabakei, Nakatsu, à Âita Prefecture, Japan. Construction work on the eight-arched bridge, built as part of a tourist road for the viewing of the nearby Aonodà Âmon, began in 1920 and was completed in 1923; repair and restoration work took place in 1999. At in length, it is the longest stone bridge in the country, and has been designated an Important Cultural Property.