Dujiangyan is a city located in the Chengdu area of Sichuan, China. It is best known for the Dujiangyan Irrigation System, an ancient water management project that has been in use for over 2,000 years. The city is surrounded by beautiful natural landscapes, including mountains, rivers, and lush greenery. The Dujiangyan Irrigation System is a UNESCO World Heritage Site and is considered one of the greatest engineering achievements of ancient China. It was built to control flooding and provide water for irrigation in the Chengdu Plain, and it continues to be an important part of the region's agricultural infrastructure.