Setoaikyō

Setoaikyo Canyon features steep rock walls made of tuff that were carved by river flow over a long period. The narrow passage between the cliffs creates a striking geological formation that rises dramatically from the water below.

The canyon developed over centuries as water continuously eroded the softer tuff rock, gradually cutting deeper into the landscape. This slow geological process created the distinctive steep walls that characterize the site today.

The name reflects the power of water that has shaped the landscape over time. Visitors can experience how the river moves through the narrow passage and feel the presence of natural forces at work.

The main way to explore the canyon is along the walking trail that leads to the Watarasshai Suspension Bridge. Plan your visit between spring and late fall when weather conditions are most favorable for walking and viewing.

A dam manages water flow in the river, but since 2004 deliberate water releases have restored more natural conditions. This allows visitors to see the full power of the river flowing through the canyon much as it would have before the dam was built.

Location: Nikko

GPS coordinates: 36.87694,139.52167

Latest update: December 9, 2025 12:23