Cheolli Jangseong

Cheolli Jangseong
Map showing the location of the two Cheolli Jangseong.
Korean name
Hangul	천리장성
Hanja	千里長城
Revised Romanization	Cheolli Jangseong
McCune–Reischauer	Ch'ŏlli Changsŏng

Cheolli Jangseong (lit. "Thousand Li Wall") in Korean history usually refers to the 11th-century northern defense structure built during the Goryeo dynasty in present-day North Korea, though it also refers to a 7th-century network of military garrisons in present-day Northeast China, built by Goguryeo, one of the Three Kingdoms of Korea.

After Goguryeo's victory in the Goguryeo–Sui Wars, in 631 Goguryeo began the fortification of numerous military garrisons after the Tang dynasty, the successor to the Sui in China, began incursions from the northwest. Its construction was supervised by Yeon Gaesomun during the reign of King Yeongnyu. The preparation and coordination was completed in 647, after which Yeon Gaesomun took control of the Goguryeo court in a coup.

The network of fortresses ran for approximately 1000 li in what is now Northeast China, from Buyeoseong (부여성, 扶餘城) (present-day Nong'an County) to the Bohai Bay.

The most important of the garrisons were as follows:

Cheolli Janseong 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, passing through these cities,