Mammoth cave national park , located in the state of kentucky , has the world ' s largest network of natural caves and underground passageways , which are characteristic examples of limestone formations 猛玛洞穴国家公园位于肯塔基州，是世界上最大的自然洞穴群和地下长廊，也是石灰岩地貌构成的典型代表。
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