Ethnologists classify Eritreans into nine language groups. The Afar live in the southeast, the Tigrinya in south central Eritrea, and the Tigre in the north. The Saho live in the south central/southeast. The Bilen live in central Eritrea, the Hadareb in the northwest, and the Kunama and Nara in the southwest. The ninth group, the Rashaida, inhabit the northwest. The Tigrinya (50% of the population), Tigre and Kunama (40%), Afar (4%), and Saho (3%) are believed to be the most populous ethnic groups.