In the Imjin-Hantan River basin, vertical cliff appears on one or both sides of the river due to the lava plateau formed by volcanic activity, and the natural barrier connecting east and west served as an obstacle to south - north transportation and a...
In the Imjin-Hantan River basin, vertical cliff appears on one or both sides of the river due to the lava plateau formed by volcanic activity, and the natural barrier connecting east and west served as an obstacle to south - north transportation and a natural military hub. For this geographical reason, there are many rapids and ferries in the Imjin-Hantan River area where it is easy to cross the river, and fortresses were built in a form suitable for the topography to prevent enemy invasion and river crossing. Existing research on the Three Kingdoms defense system of the Imjin-Hantan River basin was mainly focused on individual ruins, such as research on the construction technique of a single site, excavation research results, and character definition of the ruins based on literature data, rather than a comprehensive review of the entire defense system. Therefore, this paper examined the characteristics, interrelationships, and transportation routes of each country's defense system in the Imjin-Hantan River basin by paying attention to their temporal and spatial properties, and examined the pattern of possession, defense system and changing aspect in the Imjin-Hantan River basin during the 4th and 7th centuries. The first country to enter the Imjin-Hantan River basin was Baekje, which entered the Imjin River basin from the end of the 3rd century to the first half of the 4th century. Baekje had a close race with Goguryeo and the Imjin River basin as its border, and a defense system was built along the southern of the Imjin River to prevent Malgal and Goguryeo from moving south. The front line defense line was built along the Imjin River basin, and it is estimated that it served as a base for local governments as well as military defense. Around the end of the 4th century, Goguryeo moved southward in earnest, and in a situation where Baekje faced off on the border of the Imjin-Hantan River, Goguryeo constructed a basic type of defense facility called a wooden fence along the north of the Imjin River and the Hantan River. Since then, a stronghold of local domination has emerged at the center of transportation, centering on Eundaeri Castle and Dangpo Castle, Horogoru. In the mid-to-late 6th century, the Imjin-Hantan River area was transformed from the rear base of Goguryeo to the front where a neck-and-neck race with Silla continued, and It is highly likely that Mudungri Boru, Deokjin Castle, and Durubong Boru were built by strengthening military defenses in this area. As Goguryeo Castle is pushed to the north of the Imjin River, Silla Castle begins to be built on the south of the Imjin River and the Hantan River basin. Silla has built many new castles along the Hantan River and is recycling Baekje Castle that was distributed along the lower stream of the Imjin River. In particular, large castles such as Chiljungseong, Daejeon-ri sanseong, and Oknyeobong sanseong are distributed horizontally in the east-west direction along the south of the Imjin and Hantan River, and a defense system was established in connection with the castles located behind them.