Yalu River

Yalu River (Chinese: Ya-Lu Chiang; Korean: Amnok-Kang), river forming most of the boundary between North Korea and Manchuria, China. It rises in the Changbai Shan (Long White Mountains) of Manchuria and flows southeast 500 mi (800 km) to Korea Bay (Yellow Sea). The crossing of the river by Chinese Communist troops to help North Korea (Oct. 1950) was an important event of the Korean War.