The gorge’s distinctive hexagonal rock formations were created by cooling magma from a volcanic eruption approximately 16 million years ago.
The tunnel was originally constructed in 1996 for public safety, as falling rocks previously made the hiking path hazardous.
The 2018 renovation utilized the concept of 'tunnel of light' to integrate human architecture with raw natural geology.
The water feature in the Light Cave is maintained at a depth of only a few centimeters to ensure a consistent, reflective surface.
The tunnel was once prone to closure due to heavy snowfall, but modern maintenance allows for winter access.
Kiyotsu Gorge Tunnel is a 750-meter-long art installation and pedestrian tunnel located within the V-shaped Kiyotsu Gorge in Niigata Prefecture. The tunnel features four observation points that frame the dramatic columnar jointing of the gorge’s volcanic rock walls. The terminal point, the 'Light Cave', features a shallow water pool that creates a 360-degree mirror reflection of the canyon and sky. Designed by MAD Architects for the 2018 Echigo-Tsumari Art Triennale, the tunnel incorporates elements representing the five natural elements: wood, earth, fire, metal, and water. The walls of the tunnel are lined with stainless steel mirrors to amplify the visual depth of the space. It is located deep within the Joshin'etsu Kogen National Park area. The surrounding gorge is recognized as one of Japan's three most prominent ravines. The tunnel remains open throughout the year, though seasonal conditions significantly alter the landscape views.
The very center of the 'Light Cave' terminal point for the perfect symmetry reflection.
Wear waterproof footwear or be prepared to walk barefoot in the Light Cave to access the reflective pool area.
Bring a towel to dry your feet after walking through the water at the terminal point.
Visit on a weekday morning to minimize the number of people in your reflection shots.
Attempting to take tripod photos during peak weekend hours, as the tight space makes this disruptive to other visitors.
The tunnel may close temporarily during extreme weather events or severe winter blizzards; check local alerts before travel.
Maintain a quiet tone to allow others to enjoy the acoustics of the tunnel; do not run in the wet areas.
