Ryūga Cave
The Ryūga Cave (Ryūgadō), also known as Ryuga Cave or Ryugado Cave, is a limestone cave located in Kami City, Kōchi Prefecture, Japan. It is one of the three largest limestone caves in Japan, with a total length of 4 kilometers. The cave has been designated as a National Natural monument of Japan.
Cave data from Wikidata (CC0). Summary from Wikipedia (CC BY-SA).