|Light:||Incandescent Electric Light System|
|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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Furen shonyudo is not very big, but it is said to be one of the most beautiful dripstone caves in Japan. It is entered through a high portal, slanted about 15 degrees as the cave formation followed the cracks in the rock. It is located in a 10 Ma old limestone reef, which was uplifted and slanted by plate movement. The limestone is intensively used for the production of cement.