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GEO Information

Manjanggul lava tube

Manjang Cave is distributed across Gimnyeong?ri, Gujwa?eup, Jeju?si. The lava tube is a simple unitary passage that meanders along the lava flow direction. Stretching for as far as 7,416 m, its length ranks amongst the top 15 in the world. It is a large tube measuring up to 23 m in breadth and 30 m in height. The flow is basaltic lava, mostly composed of alkaline olivine basalt, the tube began to form about 300,000 years ago, reaching into its present shape approximately 200,000 years ago. Manjang Cave is a two?level tube; the lower level (the main tube) is 5,296m long, and the upper level (a tributary) is 2,120 m long. Inside the tube, diverse structures and the innumerable cave formations, commonly found in lava tubes, are readily found. They include lava stalactites and lava stalagmites, lava columm, lava flowstone, lava helictites and lava blister, cave corals, benches, lava raft, lava bridges, lava shelves and striations all formed in the pahoehoe (ropy) lava. Although there are three potential entrances leading into the Manjang Cave, only Entrance No. 2 and a one kilometer length, heading southward, are open to the public. At the end of the one kilometer length, a large amount of lava spilled from the upper level down to the lower level with the ceiling, creating a massive columm. This is the intimidating columm that stands 7.6 m high. Above Manjang Cave, on the extensive plains created by the lava flow, there are natural forests, thickets, ponds and strips of arable farmland. Inside the tubes, especially concentrated around the openings, sediments that consist of clay and other organic materials can be found. In the upper level tube at Entrance No. 3, in particular, large accummulations of guano can be seen providing favorable habitats for cave life. Naturally, it is here, and at the lower level main tube between Entrance No. 1 and No. 2, that most of the living creatures that inhabit the Manjang Cave can be found. In Geomunorem Lava Tube System, 38 types of cave creatures have been identified. The most commonly found species is the Jeju cave spider (Nesticellaquelpartensis). In the upper part of Entrance No. 3, at least 30,000 long winged bats (Miniopterus schreibersii fuliginosus) have permanently take up residence inside the tube, forming the largest colony of bats confirmed to be living in Korea so far Known.

Lava tubes of Geomunorem lava tube system

Lava tubes of Geomunorem lava tube system

Lava flow lines

Lava flow lines

Ropy structure

Ropy structure

Lava bridge

Lava bridge

Lava column

Lava column

Lava blister

Lava blister

Skylight(2nd entrance

Skylight(2nd entrance