Located about 500 m away from Seonchang port, Koggiribawi, or Elephant Rock, is a rocky islet that is 50 m high and about 80 m long. Columnar joints are well-developed in different directions over the rock. There is a 10 m high sea arch at the base of the rocky islet, considered as the nose of the Elephant Rock. It is called Elephant Rock since the islet looks like an elephant drinking water with its trunk. It is also referred to as ‘Gongam’ as there is a hole in the rock formation. A sea-stack is a remaining part of a rock after weaker parts of the rock have eroded away by waves. And a sea arch is a sea cave with a central hole formed by erosion. Koggiribawi is a geological attraction where features a sea-stack and a sea arch can be observed. When hot lava comes into contact with air or water, it rapidly cools and contracts, forming evenly spaced cracks on the surface. The cracks develop to become columnar-joints, referring to sets of closely fractures result in the formation of columns. The long sides of the column form parallel to the direction of heat loss as lava cools. Columnar-joints on Koggiribawi, which have developed in different directions, indicate the cooling process of lava was influenced by inconsistent topographical features or additional lava flows.