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Achasanseong
Achasanseong (Korean: 아차산성; Hanja: 阿且山城) is a Three Kingdoms-era earthen Korean fortress on the mountain Achasan, in Seoul, South Korea. Originally built by Baekje, it was occupied in turn by each of the Three Kingdoms. It is at an altitude of 200 meters above sea level. It has a perimeter of roughly 1 kilometer and an area of about 3375 m2.
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