Toma shonyudo, Limestone cave in Hokkaido, Japan.
Toma shonyudo is a limestone cave in Hokkaido that extends through five chambers over 135 meters, featuring natural formations sculpted by underground water. The passages connect these chambers with visible deposits and mineral-stained walls throughout.
The cave was discovered in 1957 during limestone quarrying operations and designated a Hokkaido Natural Monument in 1961. This official protection ended its use as a quarry site.
Sake producers use the cave to age a local liquor called Ryunozumi, taking advantage of the stable temperature and limestone walls for fermentation.
The cave is open only during warmer months, typically May through October, so plan your visit accordingly. Wear sturdy shoes with good grip since the chamber floors can be slippery from moisture.
The cave passages form a shape resembling two dragons huddled together, which inspired its original name Ezo Cave. This dragon pattern has influenced how the space is decorated and how it appears to visitors exploring it.
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