How long is the Yangtze River, the longest river in China?

Yangtze River-the longest river in China. Originated in the southwest of the main peak of Tanggula on the Qinghai-Tibet Plateau (33 28 ′ north latitude and 9108 ′ east longitude), the end of the source glacier is more than 5,400 meters above sea level. The main stream flows through Qinghai, Tibet, Sichuan, Yunnan, Hubei, Hunan, Jiangxi, Anhui, Jiangsu and Shanghai 10 provinces, municipalities and autonomous regions, and flows into the East China Sea east of Chongming Island. The tributaries also flow through eight provinces, including Gansu, Shaanxi, Guizhou, Henan, Zhejiang, Guangxi, Fujian and Guangdong. The main stream is more than 6,300 kilometers long, ranking third in the world. The drainage area is 6,543,800,000 square kilometers. Most of the river basins are located in the subtropical monsoon climate zone, which is warm and humid. The average annual precipitation is 1 100mm, and the average annual water inflow into the sea is nearly 1 trillion cubic meters, accounting for about 36% of the total river runoff in China. The water volume ranks third in the world, second only to the Amazon River and the Congo River, which is equivalent to 20 times of the Yellow River. The area of the Yangtze river basin is less than 65438+ of the total area of the country.

The Yangtze River originates from the northern foot of Tanggula Mountain on the Qinghai-Tibet Plateau and the southern side of Gladding Winter Snow Mountain. The source of the river is Tuotuo River, and its main stream flows through Qinghai, Tibet, Yunnan, Sichuan, Chongqing, Hubei, Hunan, Jiangxi, Anhui, Jiangsu, Shanghai, etc. 1 1 province (city, district), passes through the three economic zones of Southwest China, Central China and East China, and flows into the East China Sea in Shanghai. The Yangtze River, with a total length of more than 6,300 kilometers, is the largest river in China and one of the largest rivers in the world, with a drainage area of about 6,543.8+0.8 million square kilometers, accounting for 654.38+0.87% of the country's total area. The shape of the Yangtze River basin is long from east to west, short from north to south, high in the northwest and low in the southeast.

Rivers in the main stream of the Yangtze River are divided into upper, middle and lower reaches according to the characteristics of rivers and the topography of river basins. From Jiangyuan to Yichang, Hubei, it is called upstream, with a length of about 4500km and a drainage area of 1 10,000 km2. Yichang to Hukou, Jiangxi Province is called the middle reaches, with a total length of more than 950 kilometers and a drainage area of 680,000 square kilometers. The reach from Zhicheng to Chenglingji, commonly known as Jingjiang River, is about 340 kilometers long. On the south bank, there are four ports, Songzi, Taiping, ouchi and Tiao County (Tiao County was blocked in 1959), which discharge water into Dongting Lake and connect with Hunan, Zi, Yuan and East Lake. After passing Chenglingji, the Yangtze River turns to the northeast. When it reaches Wuhan, the Han River flows into Hukou, where it receives the rivers of Jiangxi, Fuzhou, Guangxi, Rao and Xiu in Poyang Lake. Hukou to the Yangtze estuary is called the downstream, with a length of 938km and a drainage area of about 654.38+200,000 km2. The plain area in the middle and lower reaches of the Yangtze River is the key area for flood control.

See Figure 2- 1 for the distribution map of major rivers and hydrological stations in the Yangtze River Basin.

About 109 large reservoirs have been built in the Yangtze River basin, with a total storage capacity of 86.7 billion m3, including more than 12 in Three Gorges, with a total storage capacity of 818 billion m3. There are 929 medium-sized reservoirs with a total storage capacity of 23.8 billion m3, of which there are over three Gorges 163 reservoirs with a total storage capacity of 3.94 billion m3.