Buan Jukmak-dong ruins, Coastal ritual site in Gyeokpo-ri, Buan County, South Korea

Buan Jukmak-dong ruins is a coastal ritual site on a cliff top at the western tip of the Byeonsan Peninsula. Excavations in 1992 uncovered an open-air altar area of about 20 by 15 metres near the Susan-dang shrine, where rituals for safe navigation were held from the 3rd to the 7th century. The site is marked by a low green panel structure on a grassy slope.

Rituals at this coastal site began in the late 3rd century with pottery offerings of the Mahan and Baekje tradition, becoming regular in the 4th and early 5th centuries. From the mid-5th century, stone replicas of mirrors and swords made mostly from Kinai stone were added, and the period up to the early 6th century marks the peak, with Baekje, Gaya and Wa ceremonies and finds including Chinese Southern Dynasties celadon and horse trappings. Rituals continued into the Joseon period, and by the 8th century a ritual building indicates a shift indoors. The site was excavated in 1992 by the National Jeonju Museum and designated Historic Site No. 541 on 19 October 2017.

The site is tied to Gaeyang Halmi, a sea goddess said to protect fishermen in the waters off the Byeonsan peninsula. A yongwangje rite praying for a good catch is held each year at Susangdang, a Jeollabuk-do tangible cultural property standing within the ruins. The name Jukmak-dong comes from the place name.

The site is easily explored on foot and features signs with basic historical information throughout. Visitors should treat the space respectfully and leave it as they found it, so others can also enjoy the experience.

Archaeologists have unearthed pottery fragments from the Goryeo period at the site, revealing the craftsmanship and artistic standards of an earlier time. These discoveries help explain how the region was economically and culturally connected to other parts of Korea.