Daya Bay (simplified Chinese: 大亚湾; traditional Chinese: 大亞灣; Mandarin Pinyin: Dàyà Wān; Jyutping: daai6aa3 waan1), also formally known as Bias Bay, is a bay of the South China Sea on the south coast of Guangdong Province in the People's Republic of China. It is bordered by Shenzhen's Dapeng Peninsula to the west and Huizhou to the north and east.
Daya Bay is home to four nuclear reactors, two each belonging to the Daya Bay Nuclear Power Plant and the Ling Ao Nuclear Power Plant, as well as the Daya Bay Reactor Neutrino Experiment. Daya Bay is located at approximately 22°35′43″N 114°32′35″E / 22.5953°N 114.5431°ECoordinates: 22°35′43″N 114°32′35″E / 22.5953°N 114.5431°E.
The Bay was a hideout of pirates in the 1920s when the Republic of China government was busy with Northern Expedition.