Guinea is a predominantly Islamic country, with Muslims representing 85 per cent of the population. Guinea's people belong to twenty-four ethnic groups. The country is divided into four geographic regions: Maritime Guinea on the low-lying Atlantic coast, the Fouta Djallon or Middle Guinea highlands, the Upper Guinea savanna region in the northeast, and the Guinée forestière region of tropical forests. French, the official language of Guinea, is the main language of communication in schools, in government administration, and the media, but more than twenty-four indigenous languages are also spoken. The largest are by far Susu, Pular, and Maninka, which dominate respectively in Maritime Guinea, Fouta Djallon, and Upper Guinea, while Guinée forestière is ethnolinguistically diverse. 