Kucong, or Black Lahu, is spoken in the following villages of Ca Lăng Commune, Mường Tè District, Lai Châu Province, Vietnam (Edmondson 2002).
In Lai Châu Province, Vietnam, Mang is spoken by 2,200 people in the districts of Sìn Hồ, Mường Tè, Phong Thổ, and in other nearby areas (Gao 2003:1), including in Nặm Ban Township, Sìn Hồ District, Lai Châu Province.
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