limestone cave; limestone cavern
A natural underground cavity formed in limestone, often featuring stalactites and stalagmites.
秋芳洞は日本最大級の鍾乳洞です。
Akiyoshidō is one of the largest limestone caves in Japan.
It's cool inside the limestone cave even in summer.
There is a large limestone cave in this mountain.
I explored a limestone cave with a friend.
The limestone cave formed over tens of thousands of years.