Luzhou, formerly transliterated as Lu-chou or Luchow, is a prefecture-level city located in the southeast of Sichuan Province, China. It is also known as the "Liquor City". It was named Jiangyang until the Northern and Southern dynasties. Situated at the confluence of the Tuo River and the Yangtze River, Luzhou has been Sichuan province's largest port in both size and output since Chongqing's separation from Sichuan in 1997. As of the 2020 Chinese census, its population was 4,254,149. Of these, 1,241,273 lived in the built-up area made of Jiangyang and Longmatan districts, as Naxi district is not conurbated yet. Luzhou borders Yunnan, Guizhou and Chongqing provinces. As the only geographic junction of the four provinces, it was an important port location in ancient China. After the PRC was founded in 1949, Luzhou became the capital of southern Sichuan province. In 1983, Luzhou was upgraded to prefecture-level city status.