They are distributed in an area stretching from the Atlantic Ocean to the Siwa Oasis in Egypt, and from the Mediterranean Sea to the Niger River. Historically, they spoke Berber languages, which together form the Berber branch of the Afro-Asiatic family. Since the Muslim conquest of North Africa in the seventh century, a large number of Berbers inhabiting the Maghreb have acquired different degrees of knowledge of varieties of Maghrebi Arabic.