What is "seosan"

Seosan (Hangul: 서산) is a small city in South Chungcheong Province, South Korea, with a population of roughly 167, 611 according to the 2014 census. Located in the approximate center of northern South Chungcheong Province (exact co-ordinates: ), Seosan is somewhat of a transportation hub for the province, especially for those travelling to Taeanhaean National Park. The neighboring town of Haemi-eup, which is about 15 minutes from Seosan by car, is largely considered to be part of the Seosan area, and is a popular weekend day-trip destination for many Seosanites.