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Towada-Hachimantai NP, Iwate
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Mount Iwate is two volcanoes joined together, not one simple cone. About 7,000 years ago, the eastern summit collapsed into a horseshoe-shaped crater; later eruptions built today’s 2,038-m Yakushi-dake inside it.
As spring snow melts, a giant eagle appears on Mount Iwate. Farmers traditionally watched for this snow pattern before beginning fieldwork; it also gave the mountain its old name, Ganshu-yama (巌鷲山).
The Hachimantai brewery Washinoo dates to 1829. Its name is linked both to Iwate’s eagle-shaped spring snow and to clear water from the mountain’s foothills—a local sake named for its landscape.
Mount Iwate’s 13-ha summit and 15-ha Fudodaira are both protected alpine-plant zones—but botanical opposites. Young, dry summit gravel supports tiny komakusa, while older, richer soil at Fudodaira carries meter-high dwarf pines and many more species.
The 1732 Yakebashiri eruption left a 4-km-long, roughly 1-km-wide lava field. Nearly 300 years later, trees still scarcely cover it; that rare preservation helped earn it Special Natural Monument status in 1952.
A 1686 eruption sent ash to Morioka and volcanic mudflows down nearby valleys; farmland at Oide was abandoned. A report to the shogunate and a map made 10 years later preserve the scale of the disaster.
One local legend casts Mount Iwate as the husband of nearby Himekami. He sent a messenger to drive her away, but the messenger left her close by—so the enraged mountain killed him.
Before historic oyamagake pilgrimages, many often-unmarried men spent 7 days purifying themselves in a retreat hut, then climbed in white robes. They brought home pine sprigs, sulfur and charms to hang in fields for good harvests and health.
In 1819, townspeople funded 10 stone guideposts from the foothills to the summit. Nine markers erected in 1822 still stand along the northern approach—a lasting trace of the pilgrimage trail built by hand.
At the traditional July 1 opening, the 3 foothill municipalities pray for safe climbs and good harvests. At noon, representatives meet on the summit for a ceremony that includes exchanging ice axes.
In 1919, a steam explosion in Iwate’s Daijigoku Valley blasted from a 9-m crater. After the crater partly collapsed, it widened to about 50 m; boulders flew and 3–15 cm of ash settled nearby.
Iwate-born poet Miyazawa Kenji turned Yakebashiri into poetry: after seeing the lava flow, he wrote Yōganryū (Lava Flow). A stone monument bearing the poem was erected near the field’s northeastern edge in 1981.
One Mount Iwate trail junction is called Tsuruhashi, or Crane’s Beak, because a patch of lingering snow resembles a crane’s bill. It’s a seasonal mountain shape preserved in a local place-name.
