Seosan

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Seosan 서산시
Municipal City
Korean transcription(s)
• Hangul	서산시
• Hanja	瑞山市
• Revised Romanization	Seosan-si
• McCune–Reischauer	Sŏsan-si
Left: Yonghyeon-ri Rock-carved triad buddha, Haemi Martyrs Shrine, Haemee Eupseong Fortress, Bowonsal Temple Ruin, Right: Samgilbo harbour, Ganworam Hermitage, Hwangguem mountain and cave, Gaesimsa Temple (all item from above to bottom)
Flag
Location in South Korea
Coordinates: 36°46′54″N 126°27′08″E / 36.78167°N 126.45222°E / 36.78167; 126.45222
Country	South Korea
Region	Chungcheong
Administrative divisions	1 eup, 9 myeon, 5 dong
Government
• Mayor	Lee Wan-seop (이완섭)
Area
• Total	742.28 km2 (286.60 sq mi)
Population  (September 2024[1])
• Total	175,144
• Dialect	Chungcheong
Time zone	UTC+9 (Korea Standard Time)
City Bird	Baikal Teal and Black-Winged Stilt[2]
City Flower	Chrysanthemum
City Tree	Pine tree
Website	www.seosan.go.kr

Seosan (Korean: 서산; Korean pronunciation: [sʰʌ.san]) is a city in South Chungcheong Province, South Korea, with a population of roughly 175,000 according to the 2017 census. Located at the northwestern end of South Chungcheong Province, it is bounded by Dangjin, Naepo New Town, Yesan-gun and Hongseong-gun on the east, Taean-gun and the Yellow Sea on the west, 125 km (78 mi) south of Seoul, 159 km (99 mi) northwest of Daejeon and 34 km (21 mi) northwest of Naepo New Town. Seosan is the hub of transportation on the west coast where the Seohaean Expressway, Daejeon-Dangjin Expressway, and National Highways No. 29, 32, 38, and 45 intersect.