Manjanggul

Manjanggul tops the list of the most beautiful caves in Korea. Gimnyeong-ri, Gujwaeup, Jeju City is home to the Manjanggul Lava Tube. It is the world's 12th-longest lava tube[1] and the second-longest on Jeju island, measuring up to 23 meters wide, 30 meters high, and 8.928 kilometers long. [2] Due to its excellent state of preservation despite its age, it is recognized as having great scientific and heritage importance (about 300,000 to 200,000 years ago). Lava stalactites and stalagmites, lava columns, lava flowstone, lava helictites, lava blisters, cave coral, benches, lava rafts, lava bridges, lava shelves, grooved lava striations, and ropy lava all have excellent preservation. The world's largest lava column, measuring 7.6 meters, is among them. There are three entrances, the second of which is open to the public and leads southward.

The most favorable environments for cave life may be found at Entrance No. 3, and there is a lower level main tube between Entrances 1 and 2 where the majority of the living species can be located. The Manjanggul Lava Tube has the most live organisms in the Geomunoreum Lava Tube System, including the Jeju cave-spider. There are at least 30,000 common bent-wing bats in the upper half of Entrance 2, making it the largest colony of bats known to be living in Korea thus far.

Location: Gimnyeong-ri, Gujwaeup, Jeju City