한때 당진포를 비롯하여 삼포 등 많은 포구들이 있었으며, 당진포에는 조선 시대 수군만호가 주둔하기도 하였다.
At one time, there were many ports including Dangjinpo Port, Sampo Part, etc. and the naval commander was stationed in Dangjinpo Port during the Joseon Dynasty.