Southwestern Mandarin
Southwestern Mandarin is commonly spoken in Kokang district in Northern Myanmar, where the population is largely Kokang. Southwestern Mandarin is also one of two official languages of the Wa State, an unrecognized autonomous state within Myanmar, alongside the Wa language. Because Wa has no written form, Chinese is the official working language of the Wa State government. Some of its speakers, known as the Chin Haw, live in Thailand. It is also spoken in parts of Northern Vietnam. Ethnic minorities in Vietnam's Lào Cai Province used to speak Southwestern Mandarin to each other when their languages were not mutually intelligible. Southwestern Mandarin is also used between different ethnic minorities in Yunnan, Guizhou and Guangxi.