Horn of Africa (Ethiopia: 96.6 million, Somalia: 10.4 million, Eritrea: 6.4 million, and Djibouti: 0.81 million). Regional studies on the Horn of Africa are carried out, among others, in the fields of Ethiopian Studies as well as Somali Studies. This peninsula is known by various names. In ancient and medieval times, the Horn of Africa was referred to as the "Bilad al Barbar" ("Land of the Berbers"). It is also known as the "Somali peninsula", or in the Somali language, "Geeska Afrika", "Jasiiradda Soomaali" or "Gacandhulka Soomaali". In other languages that are local or adjacent to the Horn of Africa, it is known
Languages of Africa expansion, in which Bantu-speaking peoples expanded over most of Sub-Equatorial Africa, displacing Khoi-San speaking peoples from much of Southeast Africa and Southern Africa and other peoples from Central Africa. Another example is the Arab expansion in the 7th century, which led to the extension of Arabic from its homeland in Asia, into much of North Africa and the Horn of Africa. Trade languages are another age-old phenomenon in the African linguistic landscape. Cultural and linguistic innovations spread along trade routes and languages of peoples dominant in trade developed into languages of wider communication (lingua franca). Of particular importance in this