Berbers or Amazighs are an ethnic group indigenous to North Africa primarily inhabiting the Maghreb. 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 in West Africa. Historically they spoke Berber languages which together form the Berber branch of the Afroasiatic family. Since the Muslim conquest of North Africa in the seventh century a large number of Berbers inhabiting the Maghreb (Tamazgha) have in varying degrees used as lingua franca the other languages spoken in North Africa. After the colonization of North Africa by France "the French government succeeded in integrating the French language in Algeria by making French the official national language and requiring all education to take place in French." Foreign languages mainly French and to some degree Spanish inherited from former European colonial powers are used by most educated Berbers in Algeria and Morocco in some formal contexts such as higher education or business.