Lake Tai or Lake Taihu is a large freshwater lake in the Yangtze Delta plain in Wuxi, China. The lake belongs to Jiangsu and the southern shore forms its border with Zhejiang. With an area of 2,250 square kilometers (869 sq mi) and an average depth of 2 meters (6.6 ft), it is the third-largest freshwater lake in China, after Poyang and Dongting. The lake houses about 90 islands, ranging in size from a few square meters to several square kilometers.
Lake Tai is linked to the renowned Grand Canal and is the origin of a number of rivers, including Suzhou Creek. In recent years, Lake Tai has been plagued by pollution as the surrounding region experienced rapid industrial development.