Gongsansung Fortress 

(Historical Relics No. 12)

 Gongsansung that is a representative fortress of Baekje was a capital after moving government to Ungin. Keum-River is in the north of Gongsansung which hight is 110m and length is 400m and width is 800m.
The total length of this fortress is 2660m.  At first it was an earth fortress but later changed to stone one.