In China, Hani is spoken mostly in areas to the east of the Mekong River in south-central Yunnan province, mostly in Pu'er and Honghe prefectures, as well as in parts of other surrounding prefectures. Hani is also spoken in Lai Châu and Lào Cai provinces of northwestern Vietnam and in Phongsaly Province of Laos along the border with Yunnan.
Edmondson (2002) reports that the Hani of Vietnam are distributed in 2 provinces of northwestern Vietnam where two distinct dialects are found, one east of Muong Te and the other to the west. The Hani of Vietnam claim to be able to communicate in the Hani language with ethnic Hani from different areas of Vietnam despite significant geographical barriers. Edmondson (2002), reported that the different Hani speech varieties in Vietnam differ mostly in lexicon.
^Nordhoff, Sebastian; Hammarström, Harald; Forkel, Robert; Haspelmath, Martin, eds. (2013). "Hani". Glottolog. Leipzig: Max Planck Institute for Evolutionary Anthropology.
Edmondson, Jerold A. 2002. "The Central and Southern Loloish Languages of Vietnam". Proceedings of the Twenty-Eighth Annual Meeting of the Berkeley Linguistics Society: Special Session on Tibeto-Burman and Southeast Asian Linguistics (2002), pp. 1–13.
Tạ Văn Thông, Lê Đông. 2001. Tiếng Hà Nhì. Hà Nội: Nhà xuất bản văn hóa dân tộc.