Cantonese (also known as Yue) is one of several major languages in China with approximately 64 million speakers. The word Cantonese derives from Canton, now known as Guangzhou, a port city in southeast China. Cantonese, as with many Chinese languages, is often considered a dialect because it shares the Chinese writing system, yet differs in the spoken form. An educated speaker of Cantonese is able to read written Chinese, but may pronounce it in his or her own dialect. There are four major groups of Cantonese dialects: Gaoyang, as it is spoken in Yangjiang; the Nanning dialect of Guinan which is spoken widely in Guangxi; Siyi (sei yap), whose best representation is the Taishan dialect (which before 1970 was widely used in U.S. Chinatowns); and Yuehai (which includes Zhongshan, also known as Chungshan, and Tungkuan, which is also known as Dongguan) which is the main dialect of Guangzhou, Hong Kong and Macau. The term Cantonese, however, generally refers to the Yuehai dialect. Cantonese is typically written in the Traditional Chinese writing system while Mandarin is written in Simplified Chinese.