The Yangtze River, also called the Chang, is the third-longest river in the world. The Yangtze begins high in the snowy mountains of western China. More than 700 smaller streams and rivers drain into the Yangtze on its 3,988 mile journey across China. The river and its tributaries drain one-fifth of China's land. The river's mouth is found near Shanghai, China's largest city, where it empties into the East China Sea. More than one-third of China's population lives along the river. In eastern China, the river is wide and deep enough for large ships to travel from the ocean to the city of Wuhan. In western China, the river passes through narrow gorges between steep mountains. Dams have been built on .....