01
A Border Group
Central Tai is the name Li Fang-Kuei gave to the Tai languages of the borderland between Guangxi and northern Vietnam. On the Vietnamese side they are Tày, spoken in Cao Bằng, Lạng Sơn, Bắc Kạn, Hà Giang and neighbouring provinces, and Nùng, whose speakers live alongside the Tày; the 2019 census counted about 1.8 million Tày and 1.1 million Nùng by ethnicity. On the Chinese side they are the Southern Zhuang varieties of southwestern Guangxi and southeastern Yunnan, among them Zuojiang (around Longzhou), Yongnan, Dai Zhuang and Nong Zhuang. The varieties shade into one another across the frontier, and many Nùng subgroups trace their ancestry to districts on the Chinese side.
The frontier itself is old. In the 11th century the region lay between Song China and the Vietnamese state of Đại Việt, and local Tai chiefs played one off against the other; the best known, Nong Zhigao (Nùng Trí Cao), rose against both and led a rebellion into Guangdong in 1052. After the Song–Đại Việt war of 1075–77 a border was settled through the Tai uplands. Speakers on its southern side became the Tày and Nùng of Vietnam, while those on the northern side were classified in the 1950s as part of the Zhuang nationality, together with the Northern Zhuang, whose language belongs to a different group.
02
Aspiration and Two Scripts
The feature Li used most to separate Central from Northern Tai is aspiration. Tày, Nùng and Southern Zhuang distinguish plain p t k from aspirated pʰ tʰ kʰ, as Thai and the other Southwestern Tai languages do, while Northern Zhuang and Bouyei have a single series. In several common words the aspirate reflects an old cluster: in Tày and many Southern Zhuang varieties 'eye' is tha, where Thai has taa and Wuming Zhuang ɣa. All three are traced to the Proto-Tai form Pittayawat Pittayaporn reconstructs as *p.ta.
Writing reflects the border. Tày and Nùng scholars and ritual specialists long wrote their language in chữ Nôm Tày, characters adapted from Chinese in the same way as Vietnamese chữ Nôm and Zhuang Sawndip, above all for the Then ritual songs and verse narratives. In 1961 a Latin alphabet for Tày and Nùng was created on the model of Vietnamese quốc ngữ; it has been used in primers, some schooling and local broadcasting. In China, Southern Zhuang speakers are served only by the standard Zhuang alphabet, which is based on the northern Wuming dialect and fits their speech poorly. On both sides most speakers are now bilingual in Vietnamese or Chinese, and younger people in towns often no longer use the language.
Where it’s spoken
- China
- Vietnam
Turning points
- Contact
A frontier through the Tai uplands
Caught between Song China and Đại Việt, Tai chiefs of the border region shift allegiance; Nong Zhigao's rebellion of 1052 is suppressed, and after the war of 1075–77 a border is settled that later divides Central Tai speakers between China and Vietnam.
Sources (1)
- Writing
A Latin alphabet for Tày and Nùng
A shared Tày-Nùng orthography is created on the basis of the Vietnamese alphabet and later approved by government decree, replacing the character-based chữ Nôm Tày for most practical purposes.
Sources (1)
Contested classifications
- Minority position
Central Tai as a genetic subgroup
Evidence for
Li Fang-Kuei (1977) set the group apart by shared vocabulary and by the way its languages treat some Proto-Tai initial consonants, and his three-way division into Northern, Central and Southwestern Tai is still the usual framework. Later computational comparison by Jerold Edmondson found Tày and Nùng varieties clustering coherently.
Evidence against
The aspirated stops that mark the group are inherited from Proto-Tai, not a shared innovation. Scholars disagreed early about its affinities: William Gedney saw it as closer to Southwestern Tai, André-Georges Haudricourt to Northern Tai. Pittayawat Pittayaporn (2009) found no innovations common to all Central Tai languages and treats the group as paraphyletic, a set of lineages from which Southwestern Tai itself emerged. Some border varieties also mix Northern and Central features. Most specialists now use Central Tai as a geographical label rather than a proven branch.
Sources (2)