These are tumuli that were constructed in the early years of the Baekje era, between the foundation of the kingdom and 475 AD, when the capital was moved to Wungjin. They exhibit a variety of information about the history of Baekje, especially with regards to burial customs, politics, society, and culture. They are located on a plain of a short embankment shape, rising 20m from the ground and extending toward both the south and north.
Even up until Korea was colonized by the Japanese, a survey suggested that there were 80 or more tumuli on this site. However, when the first excavation took place in 1974, only Nos. 3, 4, and 5 remained in their original shapes. After 1983, additional remains, such as a stone mound tomb, an earth and stone mound tomb, a stone lined tomb, a jar coffin tomb, and an earth mound tomb were confirmed, along with grave mounds, stone lined grave mounds, and cremation ceremony relics.
The No. 1 tumulus, a stone mound tomb, is a double tumulus combining a southern tumulus and the northern tumulus. The southern tumulus is a stone mound tomb. A four-stone compartment, which served as a coffin, was discovered inside the remaining stone structure. One wooden coffin was found from within the clay-filled interior of the stone compartment of the No. 2 tumulus, which is located to the south of the No. 4 tumulus.
There was a survey conducted on the east side of the No. 3 tumulus in 1986, during which earth mound tombs and jar coffin tombs were discovered on the top layer, with large earth mound tombs found on the lower layer. The large earth mound tomb was built using a method previously unknown, with eight wooden coffins placed on the very bottom layer by digging out the clay layer.
Each wooden coffin contained lacquer ware items, painted in red and black, earthenware relic, and many other objects.The stone lined tomb in Seokchon-dong is estimated to have been built