Ruins of an impressive fortress, developed in the time period from the early 5th century AD to 1675. Walls are 10 – 11 m high, 6 – 8 m wide and have a circumference of 6.6 km. Most of the walls are built on the mountain ridges.
| Location, GPS coordinates: | 38.8804 N 125.3211 E |
| Categories: | Fortresses and forts |
| Values: | Architecture, Visual |
| Rating: |  (3.5 / 5) |
| Where is located? | Asia, North Korea, South Pyongan, Ryonggang |
