Beihai is a prefecture-level city in the south of Guangxi, People's Republic of China. Its status as a seaport on the north shore of the Gulf of Tonkin has granted it historical importance as a port of international trade for Guangxi, Hunan, Hubei, Sichuan, Guizhou, and Yunnan. Between the years 2006 and 2020, Beihai is predicted to be the world's fastest growing city. Beihai has a large shipyard, but most of the money generated in the city is derived from trade.

Guangxi, officially the Guangxi Zhuang Autonomous Region, is an autonomous region of the People's Republic of China, located in South China and bordering Vietnam and the Gulf of Tonkin. Formerly a province, Guangxi became an autonomous region in 1958. Its current capital is Nanning.