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Towada-Hachimantai NP, Akita
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Daideikazan began as a hot-spring pond: steam-borne deposits filled it, then bursts of trapped steam piled the mud into a cone. Formed in 1917–18, it has kept growing into Japan’s largest mud volcano.
Most of Daideikazan is hidden: its cone rises about 1 m above ground, but the mud extends 7–8 m below. Ejected material can reach 94.5°C—nearly boiling mud beneath a modest-looking mound.
On Jan 26, 2025, a Hachimantai Visitor Center snow hike reached Daideikazan, which the center says cannot be approached up close in green season. It was still bubbling beneath the snow.
