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导言长江是中国最长的河流,全长约6300公里,流域面积约有一百八十万平方公里,平均入海流量约为每秒34,000立方米(每年约一万亿立方米),仅次于亚马逊河及刚果河,而与恒河相当。长江发源于青海。最初的一段叫沱沱河,接下是通天河,然后是金沙江。到四川宜宾与岷江汇流后才叫长江。自源头到宜昌这一段是长江上游,自宜昌至江西湖口为中游,湖口以下为下游。上游长约4530公
Introduction The Yangtze River is the longest river in China with a total length of 6,300 kilometers and a drainage area of about 1.8 million square kilometers. The average flow into the sea is about 34,000 cubic meters per second (about 1 trillion cubic meters per year) Amazon and the Congo, but rather the Ganges. The Yangtze River originated in Qinghai. The first part is called Tuotuo River, followed by Tongtianhe, then the Jinsha River. After the confluence of Sichuan Yibin and Minjiang called the Yangtze River. From the source to Yichang this section is the upper reaches of the Yangtze River, from Yichang to Jiangxi Hukou for the middle reaches, Hukou following the lower reaches. The upper reaches of about 4530 male