Tumen River

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The Tumen (Tuman) River is a river in northeast Asia, on the border between China and North Korea in its upper reaches, and between North Korea and Russia in its lower stretches. The river's name is 圖們江 in Chinese characters, which is pronounced Tumenjiang in Mandarin and Tumangang (두만강) in Korean. The name comes from the Jurchen tumen, which means "ten thousand."

The river is 521 km long, rising in the Changbai (Changbaek) Mountains and flowing into the Sea of Japan.