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Chubu-Sangaku NP, Toyama
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Water crystals gave Suisho its name, while its dark-looking slopes inspired the alternate name Kuro-dake (“Black Peak”).
Seven glacier-carved bowls, or cirques, scallop Suisho’s east face. In a 2004–05 study, a boulder lobe in Suisho C averaged −0.5°C at the surface, suggesting permafrost may persist beneath it.
Suisho is a double summit, and the taller point is the south peak at 2,986 m—about 8 m above the north peak, where the triangulation point sits.
At the nearby Suisho Hut, South Indian-style curry—made with spices ground on site—shares the menu with longtime favorite Chikara-jiru, a hearty soup with mochi and ginger.
Maps from 1700 and 1803 call the mountain Nakadake (“Middle Peak”). Later maps use Nakadake-tsurugi or Roppoishiyama, a name that evokes quartz’s six-sided crystals.
During an early Hida Range traverse in 1909, Isuke Tsujimura reached Kuro-dake and recorded quartz crystals and garnets among the gravel. Usui Kojima climbed the mountain the following year.
Near the summit and Suisho Hut, a distinctive alpine plant community is tightly localized: many rare plants disappear within a few hundred metres. Its recorded species include Shikotan-so and Chonosuke-so.
