Siyi
Seiyap, Sze Yup
Native to	Guangdong, China; Sze Yup Chinese communities in Hong Kong, Southeast Asia and the Americas.
Region	Sze Yup
Native speakers	3.9 million (2010)[citation needed]
Language family	Sino-Tibetan Sinitic Chinese Yue Siyi
Dialects	Taishanese Xinhui dialect Siqian dialect Guzhen dialect Enping dialect Kaiping dialect
Language codes
ISO 639-3	None (mis)
ISO 639-6	siiy
Glottolog	siyi1236
Linguasphere	77-AAA-mb
Siyi (lower right), among other Yue and Pinghua groups in Guangxi and Guangdong
Chinese name
Chinese	四邑方言
Transcriptions Standard Mandarin Hanyu Pinyin Sìyì fāngyán Bopomofo ㄙˋ ㄧˋ ㄈㄤ ㄧㄢˊ Yue: Cantonese Jyutping sei3 jap1 fong1 jin4 other Yue Taishanese ɬi˧ jip˥ foŋ˧ ŋun˨
Alternative Chinese name
Chinese	四邑話
Transcriptions Standard Mandarin Hanyu Pinyin Sìyìhuà Bopomofo ㄙˋ ㄧˋ ㄏㄨㄚˋ Yue: Cantonese Jyutping sei3 jap1 waa2 other Yue Taishanese ɬi˧ jip˥ va˧˨˥

Siyi (Seiyap or Sze Yup in Cantonese; Chinese: 四邑方言; pinyin: Sìyì fāngyán; Jyutping: sei3 jap1 fong1 jin4 meaning "Four Hamlets") 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 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; lit. '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.

It has also been called Delta Cantonese^[1] because all the aforementioned counties are in the Pearl River Delta.

The Siyi dialect is mainly distributed along the drainage basin of the Tan river (Chinese: 潭江), as well as part of the region west of the main stream of the Xi River, near to the confluence of the two rivers. Most of the region in which Siyi is spoken is administered by the prefecture-level city of Jiangmen, including the Jiangmen city districts of Jianghai, Pengjiang and Xinhui, as well as the county-level cities of Taishan, Kaiping, Enping and the southeastern part of Heshan, but the dialect is also spoken in parts of Zhuhai, the town of Guzhen in Zhongshan and the town of Jun'an in Foshan. In terms of geographic extremes, Siyi is spoken furthest north in Yayao (雅瑶), Heshan; furthest south in Xiachuan Island, Taishan; furthest east in Hongqi (红旗), Zhuhai; and furthest west in Naji (那吉), Enping. The total geographic area of the region is approximately 9000 square kilometers and the total number of speakers is estimated at 3.9 million in 2010.

v t e Sino-Tibetan branches
Western Himalayas (Himachal, Uttarakhand, Nepal, Sikkim)	West Himalayish Tamangic Newaric Newar Baram–Thangmi Kiranti Dhimalish Dhimal Toto Lhokpu Lepcha Greater Magaric Magaric Magar Kham Chepangic Chepang Bhujel Raji–Raute Dura–Tandrange
Eastern Himalayas (Tibet, Bhutan, Arunachal)	Bodish Tibetic East Bodish Tshangla Basum Nam? Gongduk ʼOle Tani Chamdo
Myanmar and Indo- Burmese border	Karbi Kuki-Chin Mruic Mru Hkongso Pyu Taman "Naga" Ao Angami–Pochuri Meitei Tangkhulic Zeme Sal Boro–Garo Konyak Jingpho–Luish
East and Southeast Asia	Sinitic Bai Tujia Nungish Karenic Gong Kathu Cai–Long Caijia Longjia Luren Burmo-Qiangic Qiangic Gyalrongic Ersuic Naic Lolo-Burmese Mondzish Burmish Loloish
Dubious (possible isolates) (Arunachal)	Hrusish Hruso Mijiic Kho-Bwa Puroik Miju–Meyor Songlin Greater Siangic Siangic Koro Milang Idu–Taraon
Proposed groupings	Central Tibeto-Burman Kuki-Chin–Naga Macro-Bai Mahakiranti Rung Tibeto-Burman Tibeto-Kanauri
Proto-languages	Proto-Sino-Tibetan Proto-Tibeto-Burman Proto-Loloish Proto-Karenic Proto-Min Proto-Hakka
Italics indicates single languages that are also considered to be separate branches.

v t e Chinese language
Sinitic languages
Major groups	Mandarin Northeastern Changchun Harbin Shenyang Taz Beijing Beijing Taiwan Jilu Tianjin Jinan Jiaoliao Dalian Qingdao Weihai Central Plains Dongping Gangou Guanzhong Xi'an Luoyang Xuzhou Dungan Lanyin Xinjiang Southwestern Sichuanese Chengdu–Chongqing Minjiang Leshan Renshou–Fushun Zigong Kunming Nanping Wuhan Gui–Liu Wuming Huai Nanjing Nantong Jin Zhangjiakou–Hohhot Zhi–Yan Wu Taihu Shanghai Suzhou Wuxi Changzhou Hangzhou (?) Shaoxing Ningbo Jinxiang Jiangyin Shadi Taizhou Wu Taizhou Tiantai Oujiang Wenzhou Rui'an Wencheng Wuzhou Jinhua Chu–Qu Quzhou Jiangshan Qingtian Xuanzhou Xuancheng Hui Ji-She [zh] Xiu-Yi [zh] Qi-De [zh] Yanzhou Dialect [zh] Jing-Zhan [zh] Gan Chang–Du Nanchang Yi–Liu Ying–Yi Da–Tong Xiang Changyi Changsha Loushao Shuangfeng Xiangxiang Wugang Ji–Xu Yong–Quan Qiyang Min Eastern Fuzhou Fuqing Fu'an Manjiang Southern Hokkien Quanzhou Zhangzhou Amoy Chawan Taiwan Philippine Pedan Penang Singapore Malaysian Teochew Swatow Haklau Zhongshan Nanlang Sanxiang Other Zhenan Longyan Other Northern Jian'ou Jianyang Central Pu–Xian Shao–Jiang Leizhou Zhanjiang Hainan Hakka Meixian Wuhua Huizhou Tingzhou Changting Taiwanese Sixian Hailu Raoping Yue Yuehai Guangzhou Hong Kong Xiguan Jiujiang Shiqi Weitou Dapeng Siyi Taishan Xinhui Other Gao–Yang Goulou Wu–Hua Yong–Xun Luo–Guang Qin–Lian Pinghua Northern Tongdao Younian Southern Yongjiang Guandao Rongjiang Unclassified Badong Yao Danzhou Junjiahua Mai Shaozhou Tuhua She Waxiang Xiangnan Tuhua Yeheni
Standard forms	Standard Chinese Sichuanese Taiwanese Philippine Malaysian Singaporean Standard Singdarin Cantonese Hokkien Hakka
Phonology	Historical Old Old National Cantonese Hokkien Northern Wu Mandarin Literary and colloquial readings
Grammar	Numerals Classifiers Honorifics Cantonese grammar Classical grammar
Idioms	Chengyu Xiehouyu
Input	Biaoxingma Boshiamy Cangjie Simplified CKC Dayi Pinyin Google Microsoft Sogou Stroke count Wubi (Wang Ma) ZhengMa
History	Old Chinese Eastern Han Middle Chinese Old Mandarin Middle Mandarin Proto-Min Proto-Hakka Ba–Shu Gan
Literary forms	Official Classical Adoption in Japan in Vietnam Vernacular Written Cantonese Written Dungan Written Hokkien Written Sichuanese
Scripts	Logographic Script styles Oracle bone Bronze Seal Clerical Semi-cursive Cursive Chinese characters Simplified Traditional Punctuation Braille Cantonese Mainland Chinese Taiwanese Two-cell Phonetic Cyrillization Dungan Cyrillic Romanization Gwoyeu Romatzyh Hanyu Pinyin MPS II Postal Tongyong Pinyin Wade–Giles Yale Bopomofo Cantonese Bopomofo Taiwanese Phonetic Symbols Taiwanese kana Taiwanese Hangul Xiao'erjing Nüshu
List of varieties of Chinese