Manjanggul – an epic tunnel formed by molten lava millions of years ago.

Its length stretches an impressive 8.928 kilometers, with a width of up to 23 meters and a height of 30 meters. Manjanggul proudly ranks as the 12th longest lava tube on Earth and the 2nd longest on Jeju Island. However, only a portion of the cave is open to visitors.

This geological masterpiece is part of the renowned Geomunoreum Lava Tube System, listed as a UNESCO World Heritage Site. It is home to a 7.6-meter-high lava column—the largest ever discovered on planet Earth—alongside magnificent lava stalactites, stalagmites, and shelves.

But that’s not all! Manjanggul is not only a monument to geology but also a habitat for fascinating creatures. It hosts the enigmatic Jeju cave-spider and Korea’s largest colony of bent-wing bats, numbering over 30,000 individuals.

In short, Manjanggul is a must-visit destination for anyone fascinated by volcanic artistry, biodiversity, or the thrill of walking through Earth’s ancient fiery veins.

East Jeju: Crater, the cave and the labyrinth