Great Wall of Goryeo

Cheolli Jangseong also refers to the stone wall built from 1033 to 1044, during the Goryeo dynasty, in the northern Korean peninsula. Sometimes called Goryeo Jangseong ("Great Wall of Goryeo"), it is roughly 1000 li in length, and about 24 feet in both height and width. It connected the fortresses built during the reign of Emperor Hyeonjong. King Deokjong ordered Yuso to build the defenses in response to incursions by the Khitan of the northwest and the Jurchen of the northeast. It was completed during the reign of Emperor Jeongjong. It ran from the mouth of the Yalu River to around Hamheung of present-day North Korea. Remnants are still extant, including in Ŭiju and Chŏngp'yŏng.