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(Chinese Turnen Chiang; Korean Tuman-gang), a river, most of which forms the northern boundary between the People’s Republic of China and the People’s Democratic Republic of Korea; the lower course forms the boundary between the People’s Democratic Republic of Korea and the USSR.
The Tumen River is 521 km long and drains an area of 41,200 sq km. Rising on a plateau of the Changpai Shan, the river flows for a long distance through a deep, narrow valley between the North Korea Mountains and the East Manchurian Mountains; in the lower course it flows over a hilly plain and divides into arms. It empties into the Sea of Japan. The Tumen River freezes in November, and the ice breaks up in March or April. During the spring high water, the river is navigable for junks 100 km upstream from the mouth. It is used for irrigation. The Korean cities of Musan and Hoeryong are situated on the Tumen River.