일제시기 서산에는 도선장이 13개가 있었는데, 도선장이 가장 많았던 곳은 안면도[6곳]와 대산면이었다.
During the Japanese Colonial Period, there were thirteen ferries in Seosan, and Anmyeondo (6 ferries) and Daesan-myeon were the most frequented.