Lijiang, also known as Likiang, is a prefecture-level city in the northwest of Yunnan Province, China. It has an area of 21,219 square kilometres and had a population of 1,244,769 at the 2010 census whom 211,151 lived in the built-up area made up of Gucheng District. Lijiang is famous for its UNESCO Heritage Site, the Old Town of Lijiang, which contains a mixture of different historical architecture styles and a complex, ancient water-supply system.