Inazumi Underwater Cave, Submerged limestone cave in Bungoōno, Japan
The Inazumi Underwater Cave extends over 2000 meters in length, with 700 meters accessible to visitors through illuminated pathways.
The cave formed 300 million years ago during the Paleozoic era and submerged following the major Aso volcano eruption 300,000 years ago.
The cave system belongs to the Japan Geopark network and connects to the White Mountain River, recognized among Japan's top 100 water sources.
The cave maintains a constant temperature of 15 degrees Celsius throughout the year and requires an entrance fee of 1500 yen for adults.
Visitors can observe limestone formations both underwater and above water level, displaying erosion patterns from different geological periods.
Location: Bungoono
GPS coordinates: 32.90009,131.54278
Latest update: May 24, 2025 01:51
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