Sansha City is one of the four prefecture-level cities under the jurisdiction of Hainan Province. It was established in 2012 with the revocation of the Xisha Islands, Nansha Islands and Zhongsha Islands Offices in Hainan Province. It is located in the south-central South China Sea, south of Hainan Province, and has jurisdiction over the Xisha Islands. The Zhongsha Islands, the island reefs of the Nansha Islands and their sea areas cover a total area of ​​more than 2 million square kilometers, of which the land area is more than 20 square kilometers (including the southwest sand filling land). As of 2015, Sansha City has jurisdiction over 4 administrative districts (working committees, management committees) and 10 communities. The resident population is more than 2,500 (excluding resident military police) and the household registration population is 448. The municipal government resident in Xisha, Yongxing Island. Sansha City is the county with the most geographical location, the largest total area, the smallest land area and the smallest population in China. It is the second prefecture-level administrative district built by the islands after Zhoushan City, Zhejiang Province. "Honorary title. In 2017, Sansha City was selected as one of the top 200 cities in the world.