Swahili is spoken by various ethnic groups that inhabit several large stretches of the Indian Ocean coastline from southern Somalia to northern Mozambique, including the Comoros Islands. Although only 5-10 million people speak it as their native language, Swahili is also a lingua franca of much of East Africa and the Democratic Republic of the Congo, is a national or official language of four nations, and is the only language of African origin among the official working languages of the African Union.There is as yet insufficient historical or archaeological evidence to allow one to state exactly when and where either the Swahili language or the Swahili culture emerged. Nevertheless, it is assumed that the Swahili speaking people have occupied their present territories, hugging the Indian Ocean, since well before 1000 CE.
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