Gimnyeonggul and Manjanggul Lava Tube Caves, Jeju

Welcome to Gimnyeonggul and Manjanggul—two of the world's most extraordinary lava tube caves! Picture this: these massive underground tunnels were carved by flowing lava, not water like ordinary caves. Originally one connected system, they split apart long ago when part of the cave collapsed. Manjanggul is truly massive—over 7 kilometers long, making it one of the largest lava tubes on Earth. Inside, you'll discover a wonderland of formations: lava stalactites hanging from the ceiling, stalagmites rising from the floor, and stone pillars that seem to hold up the ancient rock above. Look down at the floor, and you'll see the actual tracks left by flowing lava—real evidence of how these caves formed millions of years ago. The smaller Gimnyeonggul, about 700 meters long, features its own magic: lava formations that look like a frozen waterfall at its end. These caves are protected treasures that teach scientists worldwide about volcanic processes. Come explore where fire once flowed underground.

⚠ This is an AI-generated retelling of the official description. For accuracy, refer to the official description below.