Historical documents of Koguryo Great Wall

"The Story of Korea in the Old Tang Dynasty": "Jianwu did not dare to attack his country, but built the Great Wall, from Fuyu City in the northeast to the southwest sea, more than a thousand miles."

"The New Tang Book of Korea Biography": "The fear of building the army is to build the Great Wall of Wan Li, the northeast is to help others first, and the southwest belongs to the sea."

The History of the Three Kingdoms (Volume 20) Koguryo Biography 8: In the spring and February of the fourteenth year, Wang built the Great Wall, Fuyu City in the northeast, thousands of miles in the southwest, and it was formed in sixteen years. "