Ruins of an enormous mountain fortress, built in 470 – 473 AD. Measured length of the walls is 1,680 – 1880 m and they were 13 – 20 m tall.
| Location, GPS coordinates: | 36.4885 N 127.7423 E |
| Categories: | Fortresses and forts |
| Values: | Architecture, Visual |
| Rating: |  |
| Where is located? | Asia, South Korea, North Chungcheong, to the east from Boeun, Eoam-ri |
Samnyeon sanseong on the map
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