is one of many limestone caves located in the city of Niimi, in northwestern Okayama Prefecture, Japan.
is one of many limestone caves located in the city of Niimi, in northwestern Okayama Prefecture, Japan.
The cave is said to have been accidentally discovered by a hunter in the Edo Period. It approximately 450 meters in length with a relatively flat elevation. It contains numerous stalactites and a large underground lake. The cave was popularized by the poets Tekkan Yosano and Akiko Yosano in 1929. It was designated an Okayama Prefectural Natural Monument in 1957 and was opened as a show cave. LED lighting was installed in 2015.
Discovered by embedding cosine similarity (sentence-transformers MiniLM, 384-dim).