Zambia is, for administrative purposes, divided into eight provinces: the Northern, the Luapula, the Western, the Northwestern, the Eastern, the Central, the Southern, and the Barotse. Linguistically, it is divided into four main language groups: the Bemba, the Nyanja, the Tonga, and the Lozi. The language groupings coincide to a great extent with the provinces, with the Bemba-speaking people spread over the Northern, Luapula, Western, and parts of the Central provinces. The Nyanja speakers are in the Eastern Province, the Tonga speakers in the Southern and parts of the Central provinces, and the Lozi speakers in Barotse Province. The Northwestern Province is occupied by a group of tribes whose lingua franca is usually regarded as Luvale-Mbunda.