| Hangul: | 자모산성 |
| Hanja: | 慈母山城 |
| Rr: | Jamosanseong |
| Mr: | Chamosansŏng |
| Context: | North |
Jamo Fortress is a stone fortress dating from the Goryeo period. One of the National Treasures of North Korea, it islocated in Ojung-ni, Pyongsong, South Pyongan Province.
The fortress has a circumference of 451m (1,480feet) and a height of 2.7m (08.9feet). It suffered damage during the Second Manchu invasion of Korea. Most of the fortress has been ruined due to wind and frost in the area. It has come to be known by various names over time, including Seongsanseong, Seongjaesanseong, Jamosanseong and Gadeungsanseong.[1]