Introduction to Yongduam Rock: Located on the seaside of Yongtan Cave in the center of Jeju, it looks like a giant dragon in myths and legends. It is formed by the lava erupted from the Hallasan Mountain crater and condensed on the sea. It looks like a dragon head. The part of Yongduam rock that emerges from the sea is 10 meters high, and the part that sinks to the bottom of the sea is about 30 meters. There is Yongyeon more than 200 meters away. The scenery during the full moon is amazing.