Amur

The Amur River (Russian: река́ Аму́р) or Heilong Jiang (Chinese: 黑龙江; pinyin: Hēilóng Jiāng, "Black Dragon River") is the world's tenth longest river, forming the border between the Russian Far East and Northeastern China (Inner Manchuria).

Amur in The Hot War
When Vasili Yasevich was forced to flee Harbin, he decided to leave China entirely by crossing the Amur River into the Soviet Union.