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Joshin’etsukogen NP, Niigata
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At the final lookout, the mirror is a shallow basin of actual spring water, not polished flooring. Stainless-steel walls echo the gorge in its surface; the cold water lets visitors feel the river as well as see it.
MAD Architects imagined the 750m artwork as a submarine: its 4 lookouts act like periscopes, peeking out at the gorge. The design draws on 5 natural elements—wood, earth, metal, fire and water.
One lookout’s restroom seems to dissolve into the gorge: “Invisible Bubble” sets a mirror-finished toilet against black-and-white stripes that evoke the turbulent Kiyotsu River, making the fixture fade into the pattern.
Avalanche-packed snow can linger on the gorge floor until June. As it melts from below, the river sometimes tunnels beneath it, leaving natural snow arches over water that is still flowing.
The gorge’s rocks began as volcanic ash on an ancient seafloor about 15 million years ago. Magma intruded around 7 million years ago; uplift and river erosion eventually exposed its cracked columns.
Kiyotsu’s stone columns do not all stand upright: their long axes slant 40°–60° toward the southeast. Their angle preserves the tilt of the sheet-like magma body that cooled into this rock.
A rockfall closed Kiyotsu’s cliffside trail in 1988, and its brittle walls made reopening it unsafe. The 750m pedestrian tunnel opened in 1996 as a safer way to see the gorge without reopening the exposed route.
When crews bored the tunnel, they struck a hot spring. Today its water fills the footbath upstairs in the Periscope entrance building—an unexpected warm-water bonus created while digging a route to view the gorge.
