Somali and Arabic are the official languages of Somalia. The Somali language is the mother tongue of the Somali people, the nation's most populous ethnic group. It is a member of the Cushitic branch of the Afro-Asiatic language family, and its nearest relatives are the Oromo, Afar and Saho languages. Somali is the best documented of the Cushitic languages, with academic studies of it dating from before 1900.