Siyi dialect

Siyi
Seiyap, Sze Yup
Native to	The Sze Yup region of Guangdong province, People's Republic of China; Sze Yup Chinese communities in Hong Kong, Southeast Asia and the Americas.
Region	Sze Yup
Native speakers	3.9 million (2010)
Language family	Sino-Tibetan Chinese Yue Siyi
Dialects	Taishan dialect Xinhui dialect Siqian dialect Guzhen dialect Enping dialect Kaiping dialect
Language codes
ISO 639-3	–
ISO 639-6	siiy
Glottolog	siyi1236
Linguasphere	77-AAA-mb
Siyi (lower right), among other Yue and Pinghua groups in Guangxi and Guangdong

Siyi (Seiyap or Sze Yup in Cantonese; Chinese: 四邑方言; pinyin: Sìyì fāngyán; Jyutping: sei3 jap1 fong1 jin4) is a coastal branch of Yue Chinese spoken mainly in Guangdong province, but is also used in overseas Chinese communities. Within the province, it is mainly spoken in the prefecture-level city of Jiangmen, but pockets exist outside of Jiangmen, including the Doumen and Jinwan districts in Zhuhai, Guzhen in Zhongshan and Jun'an in Foshan. Taishanese, which was one of the most important Chinese dialects in Chinese American communities, is considered a representative dialect.

The name "Sze Yup" or "Seiyap" (Chinese: 四邑; pinyin: Sìyì; Cantonese Yale: sei yāp; literally: "Four Counties") refers to the historical four counties of Jiangmen prefecture: Xinhui, Taishan, Enping and Kaiping.

Since a fifth county, Heshan, was added to the prefecture in 1983, this region is referred to as the "Five Counties" (Chinese: 五邑; pinyin: Wǔyì; Cantonese Yale: nǵh yāp) in the province; but for historical reasons, the term "Seiyap" is still used amongst the overseas Chinese communities.