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Amami Guntō NP, Kagoshima
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Shoryudo’s enormous flowstone looks like a waterfall caught mid-cascade. It forms as flowing water leaves mineral layers on the cave walls; Japan’s official tourism interpretation describes the cave’s flowstone as the country’s largest.
A shrine inside Shoryudo commemorates human remains found with tubular stone beads, reportedly 26. A local story links them to 7th-century envoys shipwrecked on a Tang mission—but China Town council minutes say their age is unconfirmed.
Shoryudo appears in the 1977 film Yatsuhaka-mura, but the movie’s underground world was assembled from footage shot in 8 caves across Japan—including this cave and nearby Suirendo on Okinoerabu.
Shoryudo was also a location for the 1973 film Seigenki, based on a novel by Okinoerabu-born writer Jiro Isshiki. His autobiographical novel won the Dazai Osamu Prize in 1967; a film monument stands by the cave entrance.
What visitors call Shoryudo is a nearly straight chain of 4 cave sections, stretching about 3.5 km altogether. Only about 600 m is open to visitors, so the lit walkway reveals just a small part of the underground system.
The cave holds about 300,000 formations, including at least 25 types. Their shapes inspired names such as “Diamond Palace,” “Golden and Silver Falls,” and even a yokozuna’s ceremonial apron.
Shoryudo is still changing: mineral-bearing water adds about 0.3 mm to a stalactite each year. Touching the formations can leave stains or discoloration, so the cave’s bright natural surfaces are especially worth protecting.
An Ehime University expedition led by Professor Hiroshi Yamauchi discovered Shoryudo on July 16, 1963. On March 31, 1967, Kagoshima designated it a prefectural Natural Monument.
