What are the four major water conservancy projects in ancient China?

The four major water conservancy projects in ancient China are:

1. Tashan weir: Tashan weir is a great water conservancy project created by working people in ancient China. Located in the southwest of Haishu District, Ningbo City, Zhejiang Province, near Yinjiang Town and Zhangxi Exit.

Zheng Guoqu: Zheng Guoqu is a great project built by ancient working people. It belongs to the first large-scale water conservancy project in Guanzhong, located on the northwest bank of Jinghe River, 25 kilometers northwest of Jingyang County, Shaanxi Province.

Lingqu: Located in Xing 'an, Guangxi Zhuang Autonomous Region, it sailed in 2 14 BC. It is one of the oldest canals in the world and has a good reputation as the pearl of ancient water conservancy buildings in the world.

Dujiangyan: Dujiangyan is located on the Minjiang River in the west of Chengdu Plain. For more than two thousand years, it has been playing the role of flood control and irrigation, making Chengdu Plain a paradise for floods and droughts thousands of miles away from people and fertile soil. Up to now, the irrigation area has reached more than 30 counties and cities, covering an area of nearly 10 million mu. It is the longest water control project still in use in the world, which is characterized by dam-free water diversion.