Buyeo Seokseong Fortress

Sŏksŏngsansŏng (Hanja, RR: Seokseongsanseong) was a Baekje-era Korean fortress in what is now Buyeo County, South Chungcheong Province, South Korea. On January 21, 1963, its former site was made a Historic Site of South Korea. The forterss was built in the first half of the 6th century to protect the Baekje capital Sabi. It connected to the other fortresses Hwangsansŏng, Nosŏngsansŏng, Sŏnghŭngsansŏng, and Kŭmsŏngsansŏng. It is located on the summit of the mountain Pajinsan. It has three sets of walls. The outermost wall has a perimeter of 1,605 m (5, 266 ft) and an internal area of 158,352 m2 (1, 704, 490 ft2). The second wall has a circumference of 751 m (2, 464 ft) and area of 25,400 m2 (273, 000 ft2). The third wall has a circumference of 607 m (1, 991 ft) and area of 19,127 m2 (205, 880 ft2). There were 7 gates at the fortress.

Fort data from Wikidata (CC0). Summary from Wikipedia (CC BY-SA).