Pratas Island, also known as the Tungsha Islands or the Dongsha Islands, is a coral island situated in the northern part of the South China Sea administered as part of Cijin District, Kaohsiung, Taiwan. It is located about 170 nautical miles southeast of Hong Kong. It has an area of about 240 hectares, including 64 hectares of lagoon, and is the largest of the South China Sea Islands. It is the location of the Dongsha Airport.