Seosan 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)…