The Lingqu Canal (pinyin: ling qu) is located in Xing'an County, near Guilin, in Guangxi Province, China.
In 214 BC, Qin Shi Huang, the First Emperor of the Qin Dynasty (221-206 B.C.), ordered the construction of a canal connecting the Xiang and Lishui rivers to attack the nearby southern country Bai Yue. It is one of the three big water conservation projects of ancient China and the second oldest existing canal in the world. It's the first huge canal (36.4 km) in the world and the first canal with floodgates. The architect who designed the canal was Shi Lu.