In 219 BC, the Lingqu Canal, a 34 km long waterway, was constructed. It connects the two rivers, Xiangjiang and Lijiang, creating a direct link between the Yangtze River and the Pearl River. Originally built as a water passage for supplying provisions to the Qin Army aiming to conquer Guangxi, today this ancient hydraulic project plays a crucial role in local irrigation.
http://www.china.org.cn/top10/2012-06/11/content_25618757_8.htm
