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Oze NP, Fukushima
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A 120 × 70 m bowl on Hiuchigatake’s summit marks a steam-blast vent about 500 years old. One geologist proposed its white clay may connect to the 1544 白髪水 flood, when records say every village bridge fell; the cause remains debated.
About 8,000 years ago, a huge collapse on Hiuchigatake’s south flank sent a debris avalanche across the Nushiri River, likely damming it to form Lake Ozenuma. The lake is a landslide legacy, not a volcanic crater.
Hiuchigatake is a five-summit group. Its high point, Shibayasugura (2,356 m), is only 10 m above neighboring Manaitagura; from one summit you look over Ozegahara, from the other over Lake Ozenuma.
In 1889, Hinoemata local Chozo Hirano opened the first Hiuchigatake route through Nade-kubo (雪崩ッ窪, “avalanche hollow”). He also carried a stone shrine to the summit, joining the mountain’s first trail with local worship.
On Hiuchigatake, 33 high-elevation plots revealed 4 distinct communities of Japanese stone pine (ハイマツ): one grows under birch canopy, another mingles with dwarf bamboo. It’s a botanical mosaic, not a uniform alpine thicket.
