Seosan is a locality located 98.8 km north-northeast from Seoul in South Chungcheong, South Korea. The population of Seosan is 169,221 people. Asan, Boryeong, Cheonan are located close to Seosan. You can find Seosan on any map using the following decimal coordinates: 36.7817 (latitude), 126.4522 (longitude).