Информация из: “Ethnologue: Languages of the World, 16th Edition (2009)” . M. Paul Lewis · SIL International
Под угрозой исчезновения
20 percent certain, based on the evidence available
200
Speaker number data: (J. Edmondson 2002)
ГЕОГРАФИЯ
Vietnam;
ОПИСАНИЕ РЕГИОНА
Central and northeast, near the China border, Cao Bàng, Lang Son, Hà Giang, Tuye Quang, Bác Thái, Quang Ninh, Hà Bac, Lam Dòng provinces. Some settled south in Tung Nghia and Song Mao. Possibly also in Laos.
Информация из: “World Oral Literature Project” .
Под угрозой исчезновения
20 percent certain, based on the evidence available