Swahili

The Swahili language, or Kiswahili, is a Bantu language spoken by various ethnic groups that inhabit several large stretches of the Mozambique Channel coastline from northern Kenya to northern Mozambique. Closely related languages, sometimes considered dialects, are spoken in the Comoros Islands and Somalia. Although only five million or so people speak Swahili as their mother tongue, it is used as a lingua franca in much of East Africa, and the total number of speakers exceeds 140 million. Swahili serves as a national, or official language, of four nations: Tanzania, Kenya, Uganda, and the Democratic Republic of the Congo. Wikipedia