Língshuǐ Li Autonomous County (Chinese Postal Map Romanisation: Lingshui) is an autonomous county in Hainan, People's Republic of China. It is one of the six autonomous counties of Hainan with a postal code of 572400, and in 1999 a population of 318,691, largely made up of the Li people. Notably the beautiful Nuiling (牛岭) mountain delimits the tropical area of the county. A well-known natural sight, part of the Chinese Riviera is Xiangshuiwan or Perfume bay (香水湾). Monkey Island, a popular tourist destination located in Lingshui County, is a state-protected nature reserve for macaques. Lingshui is also home to the military base where a U.S airplane crew were held during the Hainan Island incident in 2001. In September 2010, officials signed and scheduled the construction of the largest sea world theme park in Asia.