Hmong (RPA: Hmoob) or Mong (RPA: Moob), known as First Vernacular Chuanqiandian Miao in China (Chinese: 川黔滇苗语第一土语; pinyin: Chuānqiándiān miáo yǔ dì yī tǔyǔ), is a dialect continuum of the West Hmongic branch of the Hmongic languages spoken by the Hmong of Sichuan, Yunnan, Guizhou, Guangxi, Hainan, northern Vietnam, Thailand, and Laos. There are some 2.7 million speakers of varieties that are largely mutually intelligible, including over 280,000 Hmong Americans as of 2013. Over half of all Hmong speakers speak the various dialects in China, where the Dananshan (大南山) dialect forms the basis of the standard language. However, Hmong Daw (White) and Mong Njua (Green) are widely known only in Laos and the United States; Dananshan is more widely known in the native region of Hmong.
Hmong or Miao, in the narrow sense, is sometimes known ambiguously as the Chuanqiandian Cluster. That term is also used for Chuanqiandian Miao as a whole, or it may be restricted to the varieties of Hmong or Miao spoken in China.
(Courtesy of Hmong Language Wikipedia)