With a total length of 4,481 meters, Bengdwigul Cave is shaped like a maze and has one of the most complex lava tube structures in the world. For geologists, this cave is invaluable since it demonstrates how lava continuously flowed over the surface of the ground and the complex route it took to eventually form a tube deep underground. Created particularly close to the earth’s surface, this cave has a number of entrance holes to the tunnel. Inside, the complex structure of the cave unfolds in the form of double-tiered or triple-tiered rooms. A range of lava formations such as lava columns and lava bridges have developed inside this mystical tube.

* The UNESCO World Heritage designated Geomunoreum Lava Tube System of Bengdwigul, Manjanggul Cave, Gimnyeonggul, Yongcheondonggul and Dangcheomuldonggul Caves.