Korean fortress
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Korean fortresses are fortifications constructed by Koreans since the Three Kingdoms of Korea period. Koreans developed a unique and distinct fortress tradition. Korea, beginning with Goguryeo, has been called "a country of fortresses"; almost 2,400 mountain fortress sites have been found in Korea.
There are numerous types of Korean fortresses, including sanseong (mountain fortress), eupseong (city fortress), pyeongjiseong, gwanseong, jangseong, chaekseong, and more.