Manjanggul (만장굴) is a lava tube located at the east of Jeju Island (제주도), South Korea. Stretching roughly 7.4 kilometers, Manjanggul is the 12th-longest lava tube in the world and the second longest on Jeju island, which is regarded as having significant scientific and heritage value.
Although Manjanggul is one of the World Heritage Sites in South Korea, the admission is cheaper than the other tourist spots since it is managed by the Jeju government.
The temperature inside Manjanggul is around 20 Celsius, and the terrain is flat, good for families.
A lava tube is a natural conduit formed by flowing lava from a volcanic vent, so the residues of eruption are everywhere inside Manjanggul.
Unlike the Karst caves in China, Manjanggul doesn’t have many man made facilities inside, the cave is still preserved well in its original form.
There are countless lava stalagmites, lava columns and lava flowstone inside Manjanggul. Among them, a big lava stone that looks like Jeju Island is the most interesting, but to Choumeizai, it looks more similar to a big abalone.
The majority of the cave is closed off, with only 1 kilometer being open to tourists. At the end of the open section, there is a 7.6 meter-tall stone pillar that is recorded as the largest in the world, you mustn’t miss it.
