Dangcheomuldonggul Cave, located in Jeju, is a lava tube estimated to have been formed some 320,000 years ago due to volcanic activity; it is located approximately 3 kilometers underground. With no entrance as such, the cave is not open to the general public and thus its original form remains preserved to this day, giving it a high geological value. Although the Dangcheomuldonggul Cave is technically a lava tube, it resembles a limestone cave due to the secondary geological formations of lime substances that have accumulated in the ground above the tube. The tunnel has a spectacular and mystical beauty with countless stalactites and stalagmites, as well as stalactite columns. The particularly thin stalactites and stalactic columns in this cave are well-known for their uniqueness and beauty. Although this is a relatively small lava tunnel, its exotic colors and the richness of the secondary topological formations make it extraordinary in terms of research value. This cave has been designated natural monument. * The UNESCO World Heritage inscribed Geomun Oreum Lava Tube System consists of Bengdwigul, Manjanggul Cave, Gimnyeonggul, Yongcheondonggul and Dangcheomuldonggul Caves.
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