Think That's Just a Stone Wall? It's the Fortress That Once Guarded Jeju's Coast
still standing along Jeju's coast today
Plenty of visitors have made it out to Jeju's oreum, Udo, or the beaches at Hyeopjae, but far fewer know about the stone wall that still runs along parts of Jeju's coastline. Called Hwanhaejangseong, this defensive wall is said to have been built along Jeju's coast from the Goryeo through Joseon periods to guard against Japanese pirate raids and other outside incursions. Most of it has crumbled or disappeared over time, but traces are still said to remain along a few stretches of coast, including Sinsan-ri in Namwon-eup, Seogwipo. Today GYULI wants to walk you through the story of Hwanhaejangseong, and the section still standing in Sinsan-ri.
Hwanhaejangseong, a Wall Said to Ring the Sea
The name Hwanhaejangseong (環海長城) is said to mean 'a long wall that rings the sea.' You can probably already picture the shape it took just from the name — it's said to have run in a long line along Jeju's coastline. Records seem to differ slightly on exactly when it was first built, so rather than pin down a specific year here, I'd rather say carefully that it's said to have been built and rebuilt in stages across the Goryeo and Joseon periods. What matters more than the exact date, I think, is the urgency behind why Jeju's people felt they had to build such a long wall along the sea in the first place.
They say the whole village would panic the moment a ship appeared beyond the waves. So they stacked stone after stone to hold the sea back.
— 🍊 GYULIThe most commonly told reason for building Hwanhaejangseong is to guard against Japanese pirate raids and other outside incursions. Jeju is an island surrounded by sea on every side, so a boat could reach a village from almost any point along the coast. Because of that, it's said that people built a defensive wall running along the coastline itself, trying to hold off outside threats before they could land. The wall is said to have been built by stacking Jeju's characteristic black, pitted basalt — less an elaborate feat of construction than a practical wall built from stones that were easy to gather right there on the shore.
The Hwanhaejangseong Still Standing in Sinsan-ri
Over time, most of the Hwanhaejangseong that once ran along Jeju's coast is said to have crumbled or been buried, leaving little trace in many areas. But along the coast of Sinsan-ri in Namwon-eup, Seogwipo, a stretch of the wall is said to remain in relatively good condition. Looking at the black stones running low along the shoreline, it's hard not to imagine what it must have felt like for the people who once stood guard there. Traces of Hwanhaejangseong are also said to remain in other coastal villages across Jeju, including Hwabuk-dong and Jocheon-eup, but the Sinsan-ri section is known as a place where you can see the sea and the wall together, relatively up close.
The Hwanhaejangseong in Sinsan-ri is said to be looked after as a valuable piece of local heritage. Since the wall itself is just an old stone structure, at a glance it might look like nothing more than a low stone fence — but knowing that centuries of effort to protect this island are layered into it changes how it feels entirely. It isn't dressed up like a typical tourist attraction, and maybe because of that, it's a place where you can quietly glimpse what Jeju's coastal villages once truly looked like.
Remembering the Time Stacked Into Every Stone
These days, most visitors to Jeju probably think first of famous beaches like Hyeopjae or Hamdeok, or the oreum. But I think there's real value in a trip that also includes standing quietly before a wall like this, and thinking about the time this island has passed through. A moment spent considering what each of these stones has lived through might stay with you longer than any single photo.
That said, since Hwanhaejangseong is a piece of old heritage, please don't climb on the stones or knock them out of place. GYULI would like to recommend walking around it carefully, taking it in with your eyes and holding it in your mind rather than touching it. It's only by visitors leaving it undisturbed, stacked one visit after another, that this old wall can stay with us for that much longer.
GYULI's Tip · The Hwanhaejangseong in Sinsan-ri sits along the coast of Namwon-eup, Seogwipo, and is said to be easier to reach by car than by public transit. As this is old heritage, please refrain from climbing on the wall or moving the stones, and since it's right on the coast, the wind can be strong, so it's a good idea to bring a jacket.