The Chang Jiang River, sometimes referred to as the Yangtze River, is the longest river that flows in Asia and the third longest river in the world. It flows for over 3,900 miles, with water that comes primarily from the glaciers at the Qinghai-Tibet Plateau in Qinghai.
There are two primary tributaries that claim to the be source of the Chang Jiang River. The People's Republic of China officially recognizes the Toutou tributary as the source of the river. The Toutou originates in the Dangla Mountain Range, or more specifically from a glacier located west of the Geladandong Mountain. However, its geographical source lies in wetlands at the head of the Dan Qu tributary at an elevation of almost 17,000 feet.
Water from the river is important for shipping, irrigation and producing power via the Three Gorges Dam. The river is also one of the world's busiest waterways. The Chang Jiang River is prone to frequent flooding. The river system receives water at both the southern and the northern end, which causes its flood season to last from May until August. The most disastrous flood of the Chang Jiang River occurred in 1954 and was responsible for killing over 30,000 people.