Distribution of Northern Tai and Central Tai languages (Zhuang, Tay-Nung and Bouyei included)
(See varieties of Zhuang.)
Longsang Zhuang, a recently described Northern Tai language, is spoken Longsang Township, Debao County, Guangxi, China. Hezhang Buyi is a moribund Northern Tai language of northwestern Guizhou that is notable for having a Kra substratum.
Pittayaporn (2009:300) distinguishes a similar group of Zhuang varieties as group "N", defined by the phonological shifts *?j, *?w -> *aj, *aw. He moves the prestige dialect of Zhuang, the Wuming dialect, from the Northern Tai Yongbei Zhuang to Yongnan Zhuang - purportedly Central Tai - as it lacks these shifts. The various languages and localities Pittayaporn includes in group N, along with their Ethnologue equivalents, are: