A limestone cave on a karst plateau in Niimi City, Okayama Prefecture designated a Natural Monument by Okayama Prefecture. Said to have been found by a hunter in the Edo period, the cave’s name, meaning “full of mysteries,” is derived from a poem written by married poets Tekkan and Akiko Yosano in 1929. The cave is around 450 meters long in total and 25 meters wide at its widest point, and its graceful spaces are filled with sights to see, including one of Japan’s best examples of a rimstone terrace formation; an underground lake named the “Palace of Dreams;” and countless soda straws, stalactites, and stalagmites.
Okayama Pref. Nimishi Toyonagakouma 2276-2 [map]
- 8:30-17:00 (entrance to the cave 16:30)
- open everyday
- Admission High School Students over 1000 yen, Junior High School Students 800 yen, Children 500 yen
- Parking Lot
Information Sources: NAVITIME JAPAN
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There is no Parking nearby.
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Okayama Main Areas
Overshadowed by Hiroshima to the west and the Kansai region to the east, Okayama is an easy spot to miss but a nature-rich gem where the Seto Inland Sea laps at its toes and peach and grape farms complete its interior. One of Japan's Three Great Gardens, Koraku-en in Okayama city is well worth a visit before progressing to Kurashiki, where preserved wooden Edo buildings line the picturesque canal.