High Quality Content by WIKIPEDIA articles! Yangzonghai Lake is located in Yiliang County, Kunming Prefecture, 45 kilometers east of Kunming City in Yunnan Province, China. About 30,000 people rely on the Lake as their drinking water. Yangzonghai Lake is noted for its underwater springs and is one of several scenic areas in Yunnan province, which is known for its biodiversity. The lake is a popular resort destination for people living in the nearby provincial capital of Kunming, which itself borders Dianchi Lake, one of China's biggest freshwater lakes but also one of its most polluted. As recently as 2002, Yangzonghai had been noted for having water clean enough for drinking and swimming. But as of September 2008, it was officially considered unfit for drinking, swimming in or fishing in, when the provincial government announced high levels of arsenic in its waters. The arsenic contamination was discovered (in June 2008) when an inspection was made of enterprises operating in the Yangzonghai basin. Eight companies were found to have been engaged in illegal polluting practices.