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Joshin’etsukogen NP, Niigata / Gunma
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At Tairappyo, turf edges around step-like bare patches retreat about 1.8 cm a year. Researchers found an unusual driver: strong spring and autumn south winds, not the winter northwest monsoon common on many Japanese peaks.
Snow near Tairappyo’s hut can reach about 4 m in snowy years. As it melts, flowers follow in a relay: June brings a colorful alpine meadow, then golden kin-kōka can carpet the summit area in early August.
The hut’s supplies arrive on human backs, not by helicopter: its operators carry food and drinks up and shoulder every bit of trash back down. With only solar power and no fridge, meals rely on vegetables that keep.
Each spring, Tairappyo’s opening ceremony is held at its 1,650 m hut, not the roadside. Participants hike more than an hour to honor the mountain deity and pray for climbers’ safety.
About 50 cm of peat blankets Tairappyo’s fossil snow hollows. Volcanic-ash layers let researchers date its buildup across much of the area to 8,000–7,000 years ago—a natural archive of postglacial landscape change.
The character 標 can mean a marker erected at a pass or confusing fork. That suits Tairappyo’s broad, flat summit, where 4 mountain routes meet: its name reads like a useful landmark.
A plant with a neighbor’s name grows here: Naeba-kisumire (苗場黄菫, “Naeba yellow violet”) is named for nearby Mt Naeba, yet it also blooms in the Tairappyo–Sennokura area as snow melts.
The tree line begins around 1,600 m, although Tairappyo rises to 1,984 m. Heavy snowfall suppresses the tall conifer belt common on subalpine mountains, leaving open, alpine-looking slopes hundreds of metres below the summit.
At Tairappyo’s ridge, air from the Pacific and Sea of Japan meets along Japan’s central watershed. Clouds build readily and views change fast; the same collision brings the snow and rain that feed its alpine plants.
