Almost no monolinguals. Ethnic population: 3,000.
Koshi Zone, Sankhuwasabha district, Mangtewa, Yaphu, and Choyang VDCs; upper Arun valley east of the river. Sunsari dialect: Sunsari district, Bhaludhunga and Bishnupaduka VDC; Dibum (Dibung) dialect: Mangtewa VDC; Mulgaon-Wangtang dialect: Yaphu VDC.
6b (Threatened). Language of recognized nationality (2002, NFDIN Act, No. 20, Section 2C), Rai nationality.
Dibum, Mulgaon-Wangtang, Sunsari. Structurally different from Western Mewahang [raf].
SOV; postpositions; noun head final; verbal affixation marks person and number; tense and aspect
The language is regarded as a dialect of Western Mewahang [raf]. Traditional religion, Hindu.