- 정포보 - 건평돈대, 굴암돈대, 삼암돈대
- 인화보 - 무태돈대
- 장곶보 - 미루지돈대, 북일곶돈대, 장곶돈대, 선수돈대
- 선두보 - 후애돈대
- An outpost, called dondae in Korean, was a small camp set up at a distance from a main military station. It was used to monitor the enemies’ movements and to stand guard against unauthorized intrusions and surprise attacks.
- In 1679, during the Joseon dynasty, Minister of Military Affairs, Kim Seok-ju (1634-1684), recommended the construction of military outposts in Ganghwado Island to King Sukjong. A local magistrate, Yun I-je (1628-1701), oversaw the construction of 48 outposts. Six additional outposts were built later. These outposts were constructed on the coastal upland of Ganghwado, with artillery emplacement surrounded by high stone walls.
- Ganghwado Island has been a strategic military defense location for over a millennia. It is located at the mouth of the Imjin and Han Rivers, which pass by the capitals of the Goryeo dynasty (918-1392), Gaeseong, and the Joseon dynasty (1392-1910), Hanyang (present-day Seoul). It was the temporary capital of Goryeo during the Mongol invasions from 1232-1270. The famous Incheon Landing of the Korean War also occurred near here, and today it lies along the border with North Korea.