"Cavern" redirects here. For other uses, see Cavern (disambiguation).
A cave or cavern is a hollow place in the ground,[1][2] especially a natural underground space large enough for a human to enter. Caves form naturally by the weathering of rock and often extend deep underground. The word cave can also refer to much smaller openings such as sea caves, rock shelters, and grottos. อ่านเพิ่มเติม
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