Beihai (Chinese Postal Map Romanisation spelling: Pakhoi; Chinese: 北海) is a prefecture-level city in the south of Guangxi, People's Republic of China. The name of the city means "north of the sea" in Chinese, signifying its status as a seaport on the north shore of the Gulf of Tonkin, which 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.