Dujiangyan (Chinese: 都江堰; pinyin: Dūjiāngyàn) is an irrigation infrastructure built in 256 BC during the Warring States period of China by the State of Qin. It is located in the Min River (Chinese: 岷江; pinyin: Mínjiāng) in Sichuan, China, near the capital Chengdu. It is still in use today to irrigate over 5,300 square kilometers of land in the region.