The lava column
7.6 metres, the world's largest.
Gary Cycles — CC BY 2.0 · Norton Ip from Hong Kong — CC BY-SA 2.0 · Olga Lipunova — CC BY-SA 3.0 · Olga Lipunova — CC BY-SA 3.0
A vast lava tube carved by molten rock flowing underground, about nine kilometres long and up to 23 metres wide and 30 metres high, one of the longest lava tubes in the world. It belongs to the Geomunoreum lava tube system and is listed with the island as a UNESCO World Heritage Site. The section open to visitors is about a kilometre long. You walk on the frozen lava floor between walls marked with lines that show the levels of the flow. It has rare formations: lava shelves and stalactites, a turtle-shaped stone that resembles Jeju Island, and at the end a lava column 7.6 metres tall, the largest of its kind known in the world. The cave was closed for about two and a half years for safety work and reopened on 30 May 2026, per visitor guides. The temperature inside stays between 11 and 21 degrees all year, and the floor is damp and uneven, so wear closed shoes and bring a light jacket. The visit takes about an hour there and back. The cave is closed on the first Wednesday of each month.
7.6 metres, the world's largest.
A stone shaped like Jeju.
Lines left by flowing lava.
Gimnyeong, north-east Jeju Island, about 30 km east of Jeju City
Yes. It reopened on 30 May 2026 after about two and a half years of closure for safety work, per visitor guides. It closes on the first Wednesday of each month.