There are many Kokborok-speaking tribes in the Indian states of West Bengal, Tripura, Assam, Mizoram and the neighbouring provinces of the country Bangladesh mainly in Chittagong Hill Tracts. There are three main dialects which are not mutually intelligible, though the western dialect of the royal family, Debbarma, is a prestige dialect understood by everyone. It is the standard for teaching and literature. It is taught as the medium of instruction up to class fifth and as subject up to graduate level. The other dialects are Jamatia, Kalai and Noatia.