
1) Asian river 2) City of Asia 3) City in China 4) City in Asia 5) City of China 6) River in Russia 7) River in Asia 8) River of Russia 9) River of Asia 10) Russian waterway 11) Russian river 12) Waterway in Asia 13) Waterway of Russia 14) Waterway in Russia 15) Waterway of Asia
Found on
https://www.crosswordclues.com/clue/tumen

a river in E Asia, flowing NE along the China-North Korea border and then SE along the border between China and Russia to the Sea of Japan. ab. 325 mi. (525 km) long. Also called,
Found on
https://www.infoplease.com/dictionary/tumen

Traditional Mongol military unit, roughly equivalent to a modern division, comprising 10,000 troops and their families.
Found on
https://www.photius.com/countries/mongolia/glossary/index.html
No exact match found.