yishui underground grand canyon |
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| navigate by keyword : art formation tree painting rock geology cave reflection autumn terrain screenshot temple nature trunk plant leaf poster wood limestone cavern natural cavith that formed underneath earth 39aph39 surfance range from few meters kilometers length depth china yishui underground grand canyon |
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| A limestone cave or cavern is a natural cavith that is formed underneath the Earth's surfance that can range from a few meters to many kilometers in length and depth. |
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