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Minami Alps NP, Nagano / Shizuoka
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In 1926, 88-year-old magnate Ōkura Kihachirō reached Akaishidake in a palanquin. More than 2,000 lumbermen and workers rushed to cut a trail, build bridges and huts; newspapers followed the grand ascent.
The “red” in Akaishidake comes from red chert in Akaishi-zawa. The rock began as shells of tiny ocean plankton called radiolarians, which settled on a distant seafloor about 100 million years ago; iron oxide gives it its color.
The small shrine near the summit shelter recalls Akaishidake’s pilgrimage-climbing days. In 1886, faith leader Horimoto Jōkichi opened a route to the mountain, and groups of worshippers followed into this remote high country.
A rock ptarmigan released after chick-protection work on Kita-dake was later recorded near Akaishidake. The unexpected dispersal linked a conservation effort in the northern Southern Alps with birds far to the south.
At 3,120.53 m, Akaishidake’s summit holds Japan’s highest-placed first-order triangulation station. This precise survey marker is part of the network used to map the country—not just a marker for reaching the peak.
Near 2,820 m on Akaishidake’s southwest saddle, a rocky tongue formed as permafrost moved boulders about 11,000 years ago. Now inactive, this fossil rock glacier preserves evidence of ancient frozen ground near Japan’s southern limit.
Two cirques—bowl-shaped hollows carved by glaciers—cut into Akaishidake’s east side. Researchers identified polished bedrock and moraine ridges there, evidence that glaciers once flowed through valleys this far south.
