Situated on the outskirts of a mountain behind Cheondong-ri in Danyang, Cheondongdonggul Cave is a limestone cave of 470 meters in length. Created 450 million years ago, the cave is known to have beautiful limestone rocks often called “flower trays.” The cave is decorated with a breathtaking array of stalactites, stalagmites, columns and soda straws as if they were part of a lush forest. Abundant animal deposits render the cave a huge specimen gallery.

Although it is a relatively small, separate cave, Cheondongdonggul boasts plethora of splendid natural features. Along with Gosu Cave (designated as Natural Monument No. 256) in Gosu-ri, Danyang, Cheondongdonggul Cave is considered one of the most beautiful limestone caves in Korea.