The On-bashi Bridge is considered one of the largest natural limestone bridges in the world.
The gorge features the Taishaku River Dam, which created the elongated Shinryu-ko Lake.
The area is designated as a protected site within the Hiba-Dogo-Taishaku Quasi-National Park.
Several caves within the gorge contain archeological evidence of early human habitation and historical religious artifacts.
The river's flow through the limestone has created deep, narrow passages known as the Taishaku-kyo valley system.
Taishaku Gorge is an 18-kilometer-long ravine carved by the Taishaku River in northern Hiroshima Prefecture. Its most distinctive feature is the On-bashi Bridge, a massive natural limestone arch spanning 90 meters across the river. The area is located within the Hiba-Dogo-Taishaku Quasi-National Park and features significant karstic topography. Visitors can explore the Shinryu-ko Lake area, formed by the damming of the Taishaku River. The gorge contains several karst caves, including the Oni-no-iwaya cave, which is historically significant for its Buddhist stone carvings. Hiking trails connect the main natural formations, primarily following the river path. Dense forest cover characterizes the landscape, offering distinct seasonal transitions from lush greenery to autumn foliage.
The viewpoint overlooking the On-bashi natural stone arch.
Wear sturdy hiking boots as trails are uneven and can be slippery near the riverbanks.
Bring insect repellent during the summer months, as the dense forest environment attracts mosquitoes.
Check the weather forecast, as heavy rain can lead to localized trail closures for safety.
Attempting to hike the entire 18-kilometer length in a single session without adequate supplies or prior planning.
Trails and certain facilities may be inaccessible during heavy winter snowfall.
Stay on marked trails to protect the fragile karst ecosystem and avoid disturbing stone statues in cave shrines.
