The Geomunoreum Lava Tube System (Korean: 거문오름 용암동굴계) is located between Seonheul-ri, Jocheon-eup and Weoljeong-ri, Gujwa-eup, Jeju City, Jeju Province, South Korea.

It is estimated that the tube system formed between about 100 and 300 thousand years ago.

Although these lava tubes are extremely large and ancient, the internal morphological features are well-preserved and the inner scenery is considered to be outstanding.

As a result, "Jeju Volcanic Island and Lava Tubes" are UNESCO World Natural Heritage Sites.

[1] Study results about the Geomunoreum Lava Tube System have been published in academic journals.