The Fuuketsu Lava Cave (Fu = wind) is a natural cave made by the eruption of Mount-Fuji in 1864. It is located very close to the Narusawa Hyouketsu lava cave.
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The Fugaku Lava cave still has ice in August
Fugaku Lava Cave sign
Visiting Fugaku Lava cave
Happy visitor of Fugaku Lava Cave
Inside Fugaku Lava Cave