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Hidakasanmyaku Erimo Tokachi NP, Hokkaido
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Poroshiri-ōgi, named for its mountain home, was formally described as a new species in 2026. It is known from an isolated limestone site near the mountain, and researchers recommend classifying it as Critically Endangered.
A Biratori Ainu uepeker, or oral tale, explains wild chestnuts as a trail of seeds: the mountain kamuy’s son scattered chestnuts from a sack while travelling from central Honshu to meet his father at Poroshiri.
A Biratori cultural-landscape account records a tradition of treating Poroshiri as a mountain to approach with restraint: people refrained from climbing out of respect for its kamuy, and even its bears were not to be hunted.
Poroshiri has 3 mapped glacial cirques: Seven Ponds, North, and East. The Seven Ponds Cirque was selected for Japan’s Geological 100 in 2007; in summer, the cirque’s landforms frame alpine flowers and seasonal pools.
Poroshiri comes from the Ainu words poro and sir, “big” and “mountain”—an apt name for Hidaka’s only peak above 2,000 m. There is also a separate Mount Tokachi Poroshiri, so this summit is sometimes called Hidaka Poroshiri.
In 2024, researchers drilled a borehole about 10 m deep near Poroshiri’s summit to investigate possible permafrost. Confirming it takes underground temperature readings over at least 2 years—not just a chilly day at the top.
In July 1925, Hokkaido Imperial University climbers led by Hidegorō Itō reached Poroshiri after approaching via the Bisei River and climbing Pipairo and Tottabetsu first—a multi-peak journey during the early exploration of the Hidaka range.
In 2013, Poroshiri was designated individually as a national scenic place within Pirikanoka. The designation recognizes landscapes connected with Ainu language, oral traditions, and places of prayer, alongside their natural beauty.
