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In page Languages of Africa:

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The Niger–Congo languages constitute the largest language family spoken in West Africa and perhaps the world in terms of the number of languages.[citation needed] One of its salient features is an elaborate noun class system with grammatical concord. A large majority of languages of this family are tonal such as Yoruba and Igbo, Akan and Ewe language. A major branch of Niger–Congo languages is the Bantu phylum, which has a wider speech area than the rest of the family (see Niger–Congo B (Bantu) in the map above).