evidence: The Yalu River (Chinese: 鸭绿江; pinyin: Yālù Jiāng) or Amnok River (Korean: 압록강; MR: Amnokkang) is a river on the border between China and North Korea. Together with the Tumen River to its east, and a small portion of Paektu Mountain, the Yalu forms the border between China and North Korea. Its valley has been the scene of several military conflicts in the past centuries. It borders North Korea to the south and China to the north. [...] According to one scholar, the Korean-Chinese border along the Yalu River is the longest unchanged international border in history, lasting for at least 1,000 years.[13][14][15] [...] - ^ "Yalu River | river, Asia". Encyclopedia Britannica. Retrieved 2021-07-06.