Overview
Yūgen-dō is a limestone cave in Higashiyama-chō, Ichinoseki City, Iwate Prefecture, known for its mysterious underground ponds and lake.
Highlights
- ●The gourd-shaped Hyōtan Pond deep within the cave
- ●Jōkon-no-Izumi, an underground lake said to exceed 10 meters in depth
- ●Ancient stalactite formations dating back some 350 million years
- ●Recognition as one of Japan's oldest known limestone caves
History
Said to have been discovered in 1980, the cave formed within rock strata dating back roughly 350 million years, making it one of Japan's oldest known stalactite caves. Inside are Hyōtan Pond, named for its gourd-like shape, and Jōkon-no-Izumi ('Spring of the Purified Soul'), an underground lake said to be more than 10 meters deep.
Access
The cave is located in Higashiyama-chō (formerly Higashiyama-chō Nagasaka), Ichinoseki City, Iwate. Visitors are encouraged to confirm opening hours and the viewing route with local tourism information before visiting.
Best season
The cave interior is said to maintain stable conditions year-round, offering a cool escape in the heat of summer and a comparatively mild refuge in winter.
Map
39.0049, 141.2578 · Wikidata
Suggested itinerary
- 1Enter the cave mouth and feel the cool underground air as you proceed
- 2Take in the distinctive gourd-like shape of Hyōtan Pond
- 3View the mysterious surface of the underground lake, Jōkon-no-Izumi
- 4After exiting, stroll the surrounding nature of Higashiyama-chō
Did you know?
💡 Hyōtan Pond takes its name from its gourd-like shape, while Jōkon-no-Izumi, an underground lake reportedly over 10 meters deep, is considered one of the cave's signature sights.
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