Chengdu is a national historical and cultural city and the birthplace of ancient Shu civilization.

The Jinsha ruins within the territory have a history of 3,000 years. King Tai of the Zhou Dynasty named it Chengdu because "a city was built in one year and a capital was built in two years"; 7 separatist regimes successively established their capitals here; it has always been the seat of state and county in each dynasty; in the Han Dynasty, it was the capital of the whole country.

One of the five major cities; the Tang Dynasty was one of the most developed industrial and commercial cities in China, known as "Yang Yi Yi Er" in history; the Northern Song Dynasty was the second largest city outside Bianjing and invented the world's first paper currency, Jiaozi.

Home to Dujiangyan, Wuhou Temple, Du Fu Thatched Cottage and other places of interest, it is an outstanding tourist city in China.

Now let me introduce to you the top ten must-see tourist attractions in Chengdu: 1. Mount Qingcheng Scenic Area Qingcheng Mountain (Mount Qingcheng), the main scenic spot of Qingcheng Mountain-Dujiangyan, a world cultural heritage, a national key cultural relics protection unit, a national key scenic spot, and a national AAAAA-level tourist attraction

Scenic spot, the Holy Land of Quanzhen Longmen Sect, one of the Ten Great Cave Heavens, one of the Four Great Daoist Mountains in China, one of the Five Fairy Mountains, and one of the Ten Scenic Spots in Chengdu.

Qingcheng Mountain is located in the southwest of Dujiangyan City, Chengdu City, Sichuan Province, 68 kilometers east of Chengdu City, and 10 kilometers southwest of the Dujiangyan Water Conservancy Project.

The scenic area covers an area of ??200 square kilometers. The highest peak, Laojun Pavilion, is 1,260 meters above sea level. Qingcheng Mountain is divided into front mountain and back mountain. Surrounded by undulating peaks and lush green trees, it enjoys the reputation of "Qingcheng is the most secluded place in the world".

The whole mountain has verdant trees, evergreen all year round, and is surrounded by peaks that look like a city outline, hence the name Qingcheng Mountain.

There are thousands of steps on the elixir ladder, and the winding path leads to secluded areas, which are won by their purity.

Inside and outside the scenic area, the tranquility of Tianshi Cave and Yuanming Palace is a major feature of Qingcheng Mountain.

From March 30 to April 30, 2020, the scenic spot launched the "You spend, I free, this April Qingcheng Mountain-Dujiangyan is yours to visit" activity. All tourists who spend money in Dujiangyan City will have the opportunity to enjoy free tours of the scenic spot.

Qingcheng Mountain was called Zhangren Mountain in ancient times and is a branch of the Qionglai Mountains.

Qingcheng Mountain is close to the snow-capped mountains of Minshan Mountain and faces the plains of western Sichuan.

The main peak, Laoxiaoding, is 1,260 meters above sea level (data measured in 2007).

Qingcheng Mountain is backed by the Qianli Minjiang River and overlooks the Chengdu Plain. The scenic area covers an area of ??200 square kilometers.

According to ancient records, Qingcheng Mountain has "36 peaks", "8 big caves", "72 small caves" and "180 sceneries".

There are 36 peaks in the whole mountain, and the peaks surround it like a city outline.

The geology and landforms of Qingcheng Mountain are characterized by "danyan ravines and red cliffs". The soil type is mainly mountainous yellow soil, and the parent rock is the slope accumulation of Jurassic purple sandstone, mudstone and conglomerate.

2. Dujiangyan Water Conservancy Scenic Area Dujiangyan Water Conservancy Scenic Area is located on the Minjiang River in the west of the Chengdu Plain in Sichuan Province and in the west of Dujiangyan City, Sichuan Province.

Dujiangyan is not only a world-famous ancient Chinese water conservancy project, but also a famous scenic spot.

The scenery near Dujiangyan is beautiful and there are many cultural relics and historic sites, including Fulong Temple, Erwang Temple, Anlan Cable Bridge, Yulei Pass, Lidui Park, Yulei Mountain Park, Yunu Peak, Lingyan Temple, Puzhao Temple, Cuiyue Lake,

Dujiangyan Water Conservancy Project, etc.

From March 30 to April 30, 2020, the scenic spot launched the "You spend, I free, this April Qingcheng Mountain-Dujiangyan is yours to visit" activity. All tourists who spend money in Dujiangyan City will have the opportunity to enjoy free tours of the scenic spot.

The main project of Dujiangyan is to divide the water flow of the Min River into two streams, one of which is introduced into the Chengdu Plain. This can not only divert floods and reduce disasters, but also divert water to irrigate fields and turn harm into benefit.

The other one flows into the Yangtze River.

The most important part of the Dujiangyan Water Conservancy Project is the Dujiangyan Canal Head Project, which is the most critical and important facility in the Dujiangyan irrigation system.

The Dujiangyan canal head project mainly consists of three parts: Yuzui diversion embankment, Feishayan spillway and Baopingkou diversion project.

It scientifically solves the problems of automatic diversion of river water, automatic sand discharge, and control of incoming water flow. The three are connected end to end, taking care of each other, and are natural and ingenious.

The Yuzui Water Divide is located at the top of the middle reaches of the Minjiang River.

It divides the rushing Minjiang River into two parts. The outer river is the original river bed, and the inner river is used for diversion and irrigation. Its ingenuity is reflected in two points.

One is that it utilizes the fact that the inner river bed is low and 60% of the water is diverted during the dry season, while the outer river bed is wide and 60% of the water is released during the flood season.

The so-called "divided into four and six, flat and drought" is exactly the truth.

Second, the fish mouth is located at the end of the first bend in the middle reaches of the Minjiang River. It cleverly utilizes the natural laws of fluid mechanics in bends, that is, surface water flows into the concave bank, and low-level water flows into the convex bank.

Therefore, the surface water with less sand and gravel content naturally flows into the inner river, while the bottom water squeezes along the convex bank of the river bend toward the outer river, and most of the sand and gravel rolls and settles on the outer river channel.

This is what the saying goes: "Divert floods at 46 and remove sand at 28".

When the fish's mouth leads the river water into the inner river, the rushing river water is ready to flow to the Chengdu Plain.

How to control the unruly wildness of Minjiang River?

Feishayan is one of the three major elements of Dujiangyan. It looks very ordinary, but in fact its function cannot be replaced by any project. It can be said to be the key to ensuring that the Chengdu Plain is not flooded.

The height of Feishayan is just 2.15 meters higher than the river bed of the Neijiang River. Its main function is that when the water volume of the Neijiang River exceeds the upper limit of the flow rate of Baopingkou, the excess water will overflow from Feishayan; in the event of a severe flood emergency,

It will also burst its banks on its own, allowing a large amount of river water to return to the normal flow of the Minjiang River.