Cheoinseong Fortress

Located in Agok-ri, Namsa-eup, Yongin-si. It is a natural hill with an elevation of 70.9m, protruding from the eastern ridge of Hyeongjebong Peak. It is situated on the route from Yongin to Jinwi and serves as a transportation hub connecting Suwon, Osan, and Anseong. The fortress has a trapezoidal layout with a total perimeter of 351m. Although small in scale, the interior is flat, offering good spatial efficiency. The walls are higher on the southwest side and lower on the northeast side. The gates were of the open-cut type, and there appear to have been two gates on the northeast wall. The walls were constructed using natural terrain, with low areas built up using the rammed-earth method. Wooden pillars were driven deep at regular intervals, with planks installed between the pillars and posts, and different types of soil were compacted to form the walls. However, at Cheoinseong Fortress, the stone base rows commonly found in Unified Silla-era rammed-earth earthen fortresses have not yet been identified. Artifacts excavated include roof tiles, pottery, ceramics from the Goryeo and Joseon dynasties, large knives, and arrowheads. Considering the construction methods and excavated artifacts, Cheoinseong Fortress is estimated to have been built between the late Silla period and early Goryeo period. Cheoinseong Fortress is well known as the site of a victory during the second Mongol invasion. It takes about 20 minutes by car from Howon IC. Nearby attractions include Jangheung Tourist Site, Songchu Resort, and Ilyeong Resort.

(Source: Cultural Heritage Administration website)