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지금까지 수집된 데이터에 의하면, 전세계의 용암동굴의 20%는 일본의 부사산과 한국의 제주도에 집약되어 있는데, 그것만으로도 용암동굴은 극히 특이하며, 아울러 귀중한 화산현상이라고 할 수가 있다.(중략)