Jeju Volcanic Island and Lava Tubes together comprise three sites that make up 18,846 ha. It includes Geomunoreum, regarded as the finest lava tube system of caves anywhere, with its multicoloured ...

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Jeju Island is an essential part of any trip to ... For those who enjoy geology, Manjanggul Cave is one of the longest lava caves in the world, stretching over 13 kilometres.