Lake Sai Bat Cave, Lava tube cave in Fujikawaguchiko, Japan.
The 386-meter-long cave system features multiple chambers with lava stalactites and solidified lava formations throughout its underground passages.
Mount Fuji's volcanic eruption between 864 and 866 created this extensive network of underground tunnels through flowing lava streams.
The cave received Natural Monument of Japan status in 1929, recognizing its geological importance and role in preserving local bat populations.
Visitors must wear protective helmets while exploring the cave, which maintains a constant temperature and remains open from March 20th to November 30th.
Five different bat species inhabit the cave system, including the Greater horseshoe bat and Japanese long-eared bat, making it a significant wildlife shelter.
Location: Fujikawaguchiko
GPS coordinates: 35.49311,138.67286
Latest update: March 5, 2025 15:20
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