Bukhansanseong

In the 132nd year of the Three Kingdoms period, Baekje was the first to build a reservoir as the northern province guarding the capital Henan Weilicheng. This area was a strategic location for Goguryeo, Baekje, and Silla to compete for this area during the Three Kingdoms period. Baekje deployed a core military force in the province to prevent Goguryeo's southward advance, and made it the central fortress of the Northern Expedition Army when the King of Koguryo implemented the northward advance policy in the 4th century.