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: 3 out of 10 stars
Where is located? Asia, South Korea, North Chungcheong, to the east from Boeun, Eoam-ri

Samnyeon sanseong on the map
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