Donghai Island (fr|'''Île de Tan-Hai''';) (Tunghai) is an island in the southeast part of the urban area of Zhanjiang, Guangdong, People's Republic of China. It has a coastline of 159.48km (99.1miles), with a total area of, making it the largest island in Guangdong and the fifth-largest island in China. In 2008, it had a population of around 160,000.[1]