Qinzhou (postal: Yamchow, simplified Chinese: 钦州; traditional Chinese: 欽州; pinyin: Qīnzhōu, Jyutping: Jam1 zau1 (Canton) /Ham1 zau1 (Local) )[1] is a prefecture-level city in Guangxi, China, lying on the Gulf of Tonkin and having an urban population of 433,000.