Gwaneumdo Island is the third largest island among the islands around Ulleungdo Island. Gwaneumdo Island was originally connected to Ulleungdo Island, but as a result of being eroded by the sea for a long time, it separated from Ulleungdo Island. There is a suspension bridge between the two islands, so visitors can travel on foot. Gwaneumdo Island has three observatories and two trails (Courses A and B), allowing one to enjoy the scenic highlights of Ulleungdo Island. Also worth seeing are the coastal cliffs of Gwaneumssanggul Twin Caves and the columnar joints that appeared due to cooling lava flows. The scenery with the various seasonal plants is spectacular. Strong winds can cause access restrictions, so it's best to check the Ulleung-gun county government office's website before visiting.