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Inazumi Underwater Cave

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The Inazumi Underwater Cave was formed 300 million years ago during the Paleozoic era. It took its current form 300,000 years ago when it was submerged by a great eruption of Mount Aso. There is lots to see inside this underwater limestone cave, unusual worldwide, including underwater stalactites, corallite, the “Bell Hall,” where bell-shaped sculptures were formed on the ceiling, and helictites.
There are countless stalactites, deep pools with a depth of over 40 meters, and clear streams that gush from unknown recesses of the cave. The contrast of the beautiful, ever-changing stalactites takes visitors into a world of illusions. The temperature inside the caves is 16 degrees all year round - cool in the summer and warm in the winter, making this underwater limestone cave wonderful to see all year round.

Street address

300 Nakatsuru, Mie-machi-oaza, Bungo Ono City, Oita Prefecture

Access

  • Around 20 minutes by car from Mie-machi (approx. 13 km)

Opening Hours

9:00 to 17:00

Closed

No yearly closures

Website

http://www.inazumi.com/

Best season

All year

Point

Spots around

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