|Address:||Omasu Limestone Cave, 2226 Hikawa, Okutama-cho, Nishitama-gun, Tokyo, Tel: 0428-83-2922.|
|As far as we know this information was accurate when it was published (see years in brackets), but may have changed since then.
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|1982||discovered by accident and opened to the public.|
|SEP-2011||closed after damages by a typhoon.|
大増鍾乳洞 (Daimasu Limestone Cave or Omasu Cave) was discovered by the owner in his backyard during some excavation work. It is quite small but conveniently located at the road and has some nice speleothems, so the owner decided to open it to the public. Unfortunately the cave was damaged by a typhoon in September 2011, closed and never reopened.