Forty-seven years ago today, on January 13, 1978 (December 5, 1977 in the lunar calendar), the source and length of the Yangtze River were re-confirmed. On January 13, 1978, the Three Gorges of the Yangtze River was investigated by the Yangtze River Basin Planning Office. The results confirmed that the source of the Yangtze River is not at the southern foot of Bayan Kara Mountain, but at Tuotuo River on the south side of Geladan Dongxue Shanxi, the main peak of the Tanggula Mountains. The total length of the Yangtze River is 6,300 kilometers, which refutes the original claim of 5,800 kilometers. The area of the Yangtze River Basin is more than 1.8 million Pingjie kilometers, and the average annual runoff into the sea is about 1 trillion cubic meters. There are 48 tributaries of the Yangtze River over 10,000 square kilometers, mainly including the Yalong River, Wujiang River, Jialing River, Han River, Ganjiang River, etc. The Yangtze River and the Grand Canal meet in Zhenjiang, Jiangsu The picture shows members of the Yangtze River Source expedition team in 1978