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Chubu-Sangaku NP, Toyama
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The gorge’s trolley railway began as a work line for power-station construction. Early sightseeing passes carried a blunt warning: “We accept no responsibility for your safety”—a reminder of how daring a ride through the gorge once was.
While workers dug a tunnel between Asohara and Sennindani for Kurobe River No. 3 Power Station, they hit rock temperatures as high as 165°C. They cooled the work face with gorge water and blasts of cold air.
At Sarutobi Gorge, the Kurobe River narrows to just 3–4 m before making a sharp turn. Sarutobi means “monkey jump”: local tradition says monkeys once leapt across this exceptionally narrow stretch.
The little gorge train wasn’t designed as a sightseeing ride: it hauled materials to power-station worksites when there were no paved roads or trucks. With almost no flat ground beside the river, builders used narrower rails and small cars.
Unazuki Onsen’s water comes from Kuronagi, about 7 km upstream along the gorge. Before modern piping, hollowed-out wooden pipes carried the hot spring water to the town—an ingenious link between a remote source and local life.
The 200 m Nezumigaeshi Cliff is named for its sheer face, said to turn back even a mouse. A local naming story adds that the cat chasing it turned back too—hence the nearby place-name Nekamata, or “cat-and-mouse.”
Kurobe Gorge is designated both a Special Place of Scenic Beauty and a Special Natural Monument. The protected area also includes detached sites: the dramatic cliff of Oku-Kane and Sarutobi Gorge, also called Keiun Gorge.
In 1917, Toyama-born chemist Jokichi Takamine—known for Taka-diastase—began investigating the Kurobe River’s potential for hydroelectric power while planning a Japan–U.S. aluminum venture.
The snow patch near Kanetsuri Station is replenished when avalanches carry snow from Mount Hyakukanzan down into the gorge, where some remains through summer. It’s a striking reminder that winter snow can linger far below the high peaks.
The Kurobe carries an unusually heavy load of sediment. The lower Dashidaira and Unazuki dams have gates to release it, and coordinated sediment flushing has been carried out during high flows since 2001, with the whole river basin and coast in view.
Yamabiko Bridge near Unazuki was once part of the trolley railway. Its name means “echo”: the sound of trains crossing the gorge carried back into the hot-spring town.
Near Keyakidaira, a walking path is cut directly into the cliff. Its large, mouth-like opening seems to swallow people as they pass, which inspired the memorable name Hitokui-iwa: “Man-Eating Rock.”
