The greater part of the country is mountainous. Its principal ranges are the Tien Shan, the Kunlun chain, and the Trans-Himalaya. In the southwest is Tibet, which China annexed in 1950. The Gobi Desert lies to the north. China proper consists of three great river systems: the Yellow River (Huang He), 2,109 mi (5,464 km) long; the Yangtze River (Chang Jiang), the third-longest river in the world at 2,432 mi (6,300 km); and the Pearl River (Zhu Jiang), 848 mi (2,197 km) long.

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