Changjin Lake is an artificial lake, located in the upper reaches of Changjin River in South Hamgyong Province, north Korea. Introduce the lake water of Surabaya into the tunnel, cross the Ling Zhan Mountains, flow southward into Chengchuan River, and then pour into Xianxing Bay. It is the largest lake in North Korea, located between the Ling Zhan Mountains and the Wolin Mountains. From the Changjin River, which originated in Huangcaoling, to the north, it forms Changjin Lake between Liutanli and Xiajieyu, and finally flows into Yalu River.

Changjin Lake is an artificial lake, located in the upper reaches of Changjin River in South Hamgyong Province, north Korea. Introduce the lake water of Surabaya into the tunnel, cross the Ling Zhan Mountains, flow southward into Chengchuan River, and then pour into Xianxing Bay. It is the largest lake in North Korea, located between the Ling Zhan Mountains and the Wolin Mountains. From the Changjin River, which originated in Huangcaoling, to the north, it forms Changjin Lake between Liutanli and Xiajieyu, and finally flows into Yalu River.