The Yalu River, also called the Amnok River (Korean pronunciation: [amnok.k͈aŋ]), is a river on the border between North Korea and China. Together with the Tumen River to its east, and a small portion of Paektu Mountain, the Yalu forms the border between North Korea and China and is notable as a site involved in military conflicts in the First Sino-Japanese War, the Russo-Japanese War and the Korean War.