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Chubu-Sangaku NP, Toyama / Nagano
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Geologists date a steam-driven explosion at Washiba-ike crater to about 1,950 years ago; yet Japan’s Meteorological Agency does not classify the wider Washiba–Kumonotaira group as an active volcano.
Old maps made the name tricky: “Washiba” once referred to neighboring Mitsumata Renge, while today’s peak was East Washiba—and in 1836 also 龍池ヶ岳, likely named for its crater lake.
Naturalist-mountaineer Shimura Urei planned to cross Washiba onward to Mount Kasa. A porter insisted Washiba was Kasa, and a second porter fell ill, so the party abandoned the traverse and retreated to the Takase valley.
A tiny stream seeps from a flower-filled meadow on Washiba’s western slope, beside the Kurobe River headwater marker. That trickle gathers into the river and eventually reaches the Sea of Japan.
Seen from Mount Yakushi or Mitsumata Renge, Washiba’s ridge is said to resemble an eagle in flight. That soaring outline is the local explanation for the name 鷲羽岳 (Washiba-dake).
In 1909, climber Isuke Tsujimura described the surrounding peaks as a whirlpool with Washiba at its center. His account captured why climbers came to regard it as a central viewpoint of the Northern Alps.
