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Towada-Hachimantai NP, Iwate
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About 7,000 years ago, East Iwate’s summit collapsed into a horseshoe-shaped crater. Later eruptions built Yakushidake—the 2,038 m high point—inside that ancient volcanic scar.
In 1686, the summit’s O-muro crater erupted explosively. Ash reached Morioka, and the eruption produced pyroclastic surges and volcanic mudflows—a dramatic event preserved in local records.
The summit’s crater plant zone joined a national Natural Monument in 1928. Hardy komakusa grows on young, dry cinders, while nearby, older Fudo-daira supports richer flower meadows and dwarf pine—a vivid timeline of volcanic succession.
For mountain pilgrims, circling Iwate’s summit crater symbolized walking through the Buddhist Pure Land. The summit’s 33 Kannon images and other stone figures still mark this sacred volcanic circuit.
After the 1686 eruption, a shrine was placed near the summit’s O-muro crater. Pilgrims regarded a nearby fumarole as divine, and sulfur was distributed from the shrine—a striking meeting of active geology and faith.
Before traditional “oyamagake” pilgrimages, climbers spent 7 days in purification huts and set out in white robes. After praying at the summit shrine, they tied charms and alpine pine to reeds in their fields for harvest and health.
Each spring, melting snow reveals an eagle-shaped patch near Iwate’s summit, traditionally watched as a sign for farm work. The image is linked to the mountain’s old name, Ganjūsan (巌鷲山); another snow shape, “Seed-Sowing Monk,” signaled rice-planting time.
In 1819, townspeople donated 10 stone guideposts for the Yanagisawa pilgrimage route from the foothills to the summit, along with a rest hut at Fudo-daira—community-funded trail infrastructure long before modern hiking.
