Beihai (Chinese: 北海; pinyin: Běihǎi; Postal romanization: Pakhoi[2]) 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.

In addition, it governs the small islands of Weizhou and Xieyang, and is directly west of Leizhou Peninsula.

(see also Administrative divisions of the People's Republic of China#Levels)[5] After the 1876 Sino-British Treaty of Yantai, eight Western nations (the UK, US, Germany, Austria-Hungary, France, Italy, Portugal, and Belgium) set up consulates, hospitals, churches, schools, and maritime customs.

[3] Extremes since 1951 have ranged from 2.0 °C (36 °F) (unofficial record of 0 °C (32 °F) was set in January 1893 on an unknown date) to 37.1 °C (99 °F).