What is the geographical profile of Dujiangyan?

Qingcheng Mountain-Dujiangyan was listed on the World Heritage List by UNESCO Heritage Committee in June 2000.

Dujiangyan is a famous ancient water conservancy project, located in the west of Dujiangyan City, Sichuan Province. Du 'an County was named Du 'an weir in ancient times. Known as Dujiangyan after the Song and Yuan Dynasties, it is known as the "treasure of Zhenchuan". Built in the 3rd century A.D., it is a large-scale water conservancy project built by Li Bing, the prefect of Shu County of Qin State in China during the Warring States Period. It is the oldest and only surviving water conservancy project in the world, which is characterized by not building a dam to divert water. For more than 2200 years, it still plays a huge role. Li Bing's water control is a great masterpiece of the civilized world and a great water conservancy project that benefits the people. It is the oldest and only water conservancy project in the world, which is characterized by dam-free water diversion. This is a monument in the history of science and technology in China.

The most important part of Dujiangyan water conservancy project is Dujiangyan canal head project, which is the key facility of Dujiangyan irrigation system. The head of the canal is mainly composed of three major projects: Yuzui diversion dike, Baojiangkou diversion project and Sha Fei weir spillway. Baokou water intake was a part of Hutou Rock in Xushan before Baokou excavation. According to the characteristics of water flow and topography, Li Bing cut a wedge-shaped hole with a bottom width of17m at the gentle slope. In dry season, the width of the canyon is19m, and in wet season, it is 23m. According to Yongkang Military Records, "Spring ploughing is like gold, which is called' golden irrigation'". Therefore, the bottle mouth of Aquarius was also called the golden pouring mouth in ancient times. Bottle mouth is the throat of water intake in Neijiang, and it is the key water conservancy facility of "crossing the flood and drought with people" in Neijiang. Because of its magnificent natural landscape, the bottle mouth is known as "Staying Piles to Lock the Gorge" and is one of the famous "Ten Scenes of Guanyang" in history.

Sha Fei weir is the spillway in the middle section, which has the function of flood discharge and sediment discharge, and Baokou has the function of water diversion and water control. Therefore, Dujiangyan water conservancy project scientifically solved the problems of automatic diversion, automatic sediment discharge, automatic drainage and water diversion of river water, and achieved the effect of "irrigating fields with water to prevent floods and disasters", which is a great miracle in the history of water conservancy projects in the world.

For more than 250 years, water diversion irrigation has made Sichuan a land of abundance. Dujiangyan is the source of abundance and still plays an irreplaceable role, irrigating more than 6,543,800 mu of fertile land.

Dujiangyan enjoys unique tourism, including Dujiangyan, a large-scale water conservancy project, Longchi National Forest Park, a famous Taoist mountain, Qingcheng Mountain, and many cultural landscapes, historical sites and modern entertainment facilities. It is only 48 kilometers away from Chengdu, and the National Highway 2 13 runs through it, which is the only way for Chengdu to reach Huanglong and Jiuzhaigou.