Bodo is a Sino-Tibetan language of the Bodo group. It is closely related to the Dimasa language and Tiwa (Lalung) Language of Assam. It is also related to the Garo language of Meghalaya and the Kokborok language of Tripura. The Bodo speaking areas of Assam stretch from Dhubri in the west to Sadiya in the east. In Alipurduar, Cooch Behar and Jalpaiguri and other parts of Bengal, the Boros are known as "Mech". According to the 1991 census, the population of Boro speakers was 1,984,569 (Bodo 1,324,748), (Mech 659,821). The census reports of Bodo tribe, however, includes only the Bodos. It excludes the Mech tribe. The word "Boro" means the language and the community. It is pronounced with a high tone on the second syllable.