Onbashi is a natural bridge formed by a massive limestone rock, measuring 90 m long and 19 m wide and 40 metres in height. It can be found in Taisyaku valley (appr. 34°51'46.78"N 133°12'23.90"E), an about 18 kilometres long ravine along the Taishaku River Shōbara and Jinsekikōgen in the Hiroshima Prefecture. It has been designated as a natural monument, as well as being selected as one of Japan’s top 100 bridges.
Japan 2003, Onbashi Natural Bridge.
Japan 2013, Onbashi Natural Bridge.
The stamp was issued in the series
"60th Anniversary Series of the Enforcement of the Local Autonomy Hiroshima Prefecture".