The gorge’s walls consist of rare columnar jointing formed by cooling lava, appearing as hexagonal stone pillars.
The 'Tunnel of Light' installation includes a 'color bubble' feature that serves as a public restroom designed with one-way mirrors.
The tunnel was renovated specifically for the 2018 Echigo-Tsumari Art Triennale to incorporate modern architectural interventions.
The tunnel was originally built to allow visitors to view the gorge without the dangers of rockfalls, which plagued the previous trail system.
Kiyotsu Gorge Tunnel is a 750-meter-long subterranean passage carved through rock that provides safe access to view one of Japan's three most prominent gorges. The tunnel features a series of art installations, most notably the 'Tunnel of Light' designed by MAD Architects for the Echigo-Tsumari Art Triennale. At the end of the tunnel, a shallow reflecting pool creates a mirrored surface that doubles the visual impact of the gorge walls and the river below. The gorge itself is characterized by striking columnar jointing formations in the cliffside, created by volcanic activity millions of years ago. It functions as an all-weather observation facility, protecting visitors from steep terrain while providing framed perspectives of the Kiyotsu River. The tunnel interior utilizes stainless steel and polished surfaces to enhance the play of light and reflection against the rugged rock walls.
The very end of the tunnel, standing in the center of the water pool to capture the symmetrical reflection of the gorge through the tunnel opening.
Check the official website for reservation requirements, as entry timeslots may be mandatory during peak seasons or weekends.
Wear footwear that you do not mind getting slightly damp, as the final viewing area involves walking through shallow water to reach the center.
Visit during the off-peak hours to avoid heavy crowds that obscure the reflection in the tunnel's final pool.
Do not attempt to walk in the river itself, as the water levels can rise rapidly and the currents are dangerous.
May close temporarily during winter due to heavy snow accumulation; check for maintenance closures before traveling.
Visitors must remove footwear or use provided coverings if requested when entering the shallow water section of the final observation point.
