1. The upper reaches of the Yangtze River are Yichang City, Hubei Province.
2. The Yangtze River between Yichang City, Hubei Province and Hukou County, Jiujiang City, Jiangxi Province is the middle reaches of the Yangtze River.
3. The Yangtze River below Hukou County, Jiujiang City, Jiangxi Province is the lower reaches of the Yangtze River.
Second, the dividing line between the upper, middle and lower reaches of the Yellow River.
1. The upper reaches of the Yellow River are above Hekou Town, Togtoh County, Inner Mongolia Autonomous Region.
2. The Yellow River between Hekou Town, Tuoketuo County, Inner Mongolia Autonomous Region and Mengjin County, Luoyang City, Henan Province is the middle reaches of the Yellow River.
3. The Yellow River below Mengjin County, Luoyang City, Henan Province is the lower reaches of the Yellow River.
Extended data:
First, the main stream of the Yangtze River
1, upstream
The main stream of the Yangtze River is in the upper reaches of Yichang City, with a length of 4504km, accounting for 70.4% of the total length of the Yangtze River, and the control basin area is 654.38+0.0000 square kilometers. Yibin, known as Jinsha River, has a total length of 3464km and a drop of about 5 100m, accounting for 95% of the total drop of the whole river. The riverbed is steep and the beach speed is fast, and the main tributary is Yalong River. The total length from Yibin to Yichang is 1040km, and the main tributaries are Minjiang River and Jialing River on the north bank and Wujiang River on the south bank. ?
2. Right in the middle of the river
Yichang City to Hukou County is the middle reaches, with a length of 955km and a drainage area of 680,000 square kilometers. The main tributaries of this section are four rivers of Qingjiang and Dongting Lake in Hunan, Zi, Yuan and Li, and five rivers of Poyang Lake in Jiangxi, Fu, Xin, Xiu and Rao. There is the Han River on the north bank. This section is the famous Jingjiang Zhicheng to Chenglingji, with Songzi, Taiping, ouchi and Rao on the south bank. ?
3. Downstream
Hukou County is located in the lower reaches of the estuary, with a length of 938 kilometers and an area of 654.38+200,000 square kilometers. The main tributaries are Qingyi River, Shuiyangjiang River, Taihu Lake and Chaohu Lake.
Second, the main stream of the Yellow River
1, upstream
The upper reaches are Heyuan to Hekou Town, Tuoketuo County, Inner Mongolia Autonomous Region, with a river length of 347 1.6km and a drainage area of 428,000 square kilometers, accounting for 53.8% of the total drainage area.
2. Right in the middle of the river
The Yellow River runs from Hekou Town to Taohuayu, Zhengzhou City, Henan Province. The middle reaches are1206.4km long, with a drainage area of 344,000km2, accounting for 43.3% of the total drainage area, with a drop of 890m and an average gradient of 7.4? .
3. Downstream
Taohuayu to the mouth of the Yellow River is downstream. The basin covers an area of 23,000 square kilometers, accounting for only 3% of the total basin area. The river is 785.6 kilometers long with a drop of 94 meters. The gradient is steep and gentle, with an average value of 1. 1.65438? . The lower reaches of the river cross the North China Plain, and most rivers are constrained by dikes.
The total area of the river is 4240 square kilometers. Due to a large amount of sediment deposition, the river channel is raised year by year, and the riverbed is 3-5 meters higher than the back river. Cao Gang, Fengqiu and some other river sections in Henan are 10 meters higher, which are world-famous "suspended rivers" and become the watershed of Huaihe River and Haihe River systems.
Baidu encyclopedia-Yangtze river
Baidu Encyclopedia-Yellow River