Qinling: The saying of the Huai River! There is also the saying of the 400 meter precipitation line!

There are many divisions of the north and south, language, culture, customs, geography, etc., and the boundaries have not been so clear and clear, many are relative concepts, but Jiangsu has always been regarded as a southern province, Jiangsu cities are generally considered to be southern cities except for Xu and Lian, Huai'an has a magnificent southeast first state since ancient times, and Chuzhou is also very different from the main urban area of Huai'an (such as language differences, such as the Spring Festival Chuzhou only eats rice balls, such as Chuzhou only sees the word Jianghuai and no Huaihai, etc.). There is no official statement on whether the Huai River can replace the Huai River that flows into Hongze Lake or whether the waterway into the river can replace the Huai River, as for the so-called northern Jiangsu irrigation canal as the boundary, I am afraid that it is the result of false rumors (there is no authoritative statement), what Huai'an people need to do is to clean up the source. The article of the list of "China National Geographic" magazine argues:

Although many of China's mountains are famous, most of them would not have existed for China, but if there were no Qinling Mountains, China would not be China. Geographers believe that the Qinling Mountains and the Huai River divide China into the south and the north, but standing on the edge of the Huai River, it is difficult for you to see that the landscape on both sides of the river is divided into north and south, because the Huai River as the dividing line is a virtual line between the north-south transition zone of China (as far as the demarcation is concerned, it can be considered that the Huai River is just an extension of the Qinling Mountains, without the Huai River, it has little impact on the demarcation, but only makes sense of the expression), but the Qinling Mountains are different. In the center and central part of China, the Qinling Mountains are so horizontal from east to west, and the landscape of the south and north of the mountains suddenly changes.

It's going to be the college entrance examination, hehe, the 800-meter isoprecipitation line, the dividing line of the three ladders, I can't remember, that's probably it.

The annual precipitation is 800 mm, and the annual precipitation is greater than 800 mm in the south of the Qinling-Huaihe River. The annual precipitation north of the Qinling-Huaihe River is less than 800 mm.

Qinling Huaihe River Line (referred to as Qinhuai Line), is often said to be the geographical boundary between the southern region and the northern region of China's monsoon region, the south and north of this line, whether it is natural conditions, agricultural production methods, or geographical features and people's living customs, there are obvious differences.

The first line of the Huaihe River in the Qinling Mountains is the 800 mm isoprecipitation line in China, and the annual precipitation in the south is above 800 mm and below 800 mm in the north.

The long Qinling Mountains block the moist air flow from the south, and the southern slope of the Qinling Mountains, located on the windward slope of the mountains, has a large amount of precipitation. The north of the Qinling Mountains is on a wide slope, which is on the leeward slope and has little precipitation.

The area south of the Huai River in the Qinling Mountains has a low latitude, a large solar altitude angle, and receives more solar radiation energy, so the annual average temperature is higher.

The area north of the Huai River in the Qinling Mountains has a high latitude and a small solar altitude angle, so it receives less solar radiation energy, so the average annual temperature is low.

Because there is a big difference in temperature and precipitation between the north and south sides of the Huaihe River in the Qinling Mountains, the climate is very different.

Xi used to take the Qinling Mountains and the Huai River as the geographical dividing line between the north and south of China.