Jeju Samseonghyeol (제주 삼성혈)

Jeju Samseonghyeol is a prehistoric oral tradition site where it is said that Go Eul-na, Yang Eul-na, and Bu Eul-na—the progenitors of the Go, Yang, and Bu clans—emerged from the ground. The site features three holes arranged in a character shape, along with various monuments such as Samseongjeon, Hongmun, and Hyeolbi, which were built to honor them. Chunchujae is performed every spring and autumn, and Geondaeje is held in December as a festival for the people of Jeju.