<Tr> <Td> Zaghawa </Td> <Td> Nilo - Saharan, Eastern Saharan </Td> <Td> Zaghawa </Td> <Td> Chad Basin </Td> <Td> Chad, Sudan </Td> <Td> <1 </Td> <Td> </Td> </Tr> <Table> <Tr> <Th> Name </Th> <Th> Family </Th> <Th> Language </Th> <Th> Region </Th> <Th> Country </Th> <Th> Population (million) </Th> <Th> Notes </Th> </Tr> <Tr> <Td> Afar </Td> <Td> Afro - Asiatic, Cushitic </Td> <Td> Afar </Td> <Td> Horn of Africa </Td> <Td> Ethiopia, Djibouti, Eritrea </Td> <Td> 2.5 </Td> <Td> </Td> </Tr> <Tr> <Td> Agaw </Td> <Td> Afro - Asiatic, Cushitic </Td> <Td> Agaw </Td> <Td> Horn of Africa </Td> <Td> Ethiopia, Eritrea </Td> <Td> </Td> <Td> </Td> </Tr> <Tr> <Td> Amhara </Td> <Td> Afro - Asiatic, Semitic </Td> <Td> Amharic </Td> <Td> Horn of Africa </Td> <Td> Ethiopia </Td> <Td> 24 </Td> <Td> </Td> </Tr> <Tr> <Td> Beja </Td> <Td> Afro - Asiatic, Cushitic </Td> <Td> Beja </Td> <Td> Horn of Africa </Td> <Td> Sudan, Eritrea </Td> <Td> </Td> <Td> </Td> </Tr> <Tr> <Td> Bilen </Td> <Td> Afro - Asiatic, Cushitic </Td> <Td> Bilen </Td> <Td> Horn of Africa </Td> <Td> Eritrea </Td> <Td> 0.2 </Td> <Td> </Td> </Tr> <Tr> <Td> Gurage </Td> <Td> Afro - Asiatic, Semitic </Td> <Td> Gurage </Td> <Td> Horn of Africa </Td> <Td> Ethiopia </Td> <Td> 1.9 </Td> <Td> </Td> </Tr> <Tr> <Td> Oromo </Td> <Td> Afro - Asiatic, Cushitic </Td> <Td> Oromo </Td> <Td> Horn of Africa </Td> <Td> Ethiopia, Sudan, Kenya </Td> <Td> 40 </Td> <Td> </Td> </Tr> <Tr> <Td> Rashaida </Td> <Td> Afro - Asiatic, Semitic </Td> <Td> Arabic </Td> <Td> Horn of Africa </Td> <Td> Eritrea, Sudan </Td> <Td> 0.2 </Td> <Td> </Td> </Tr> <Tr> <Td> Saho </Td> <Td> Afro - Asiatic, Cushitic </Td> <Td> Saho </Td> <Td> Horn of Africa </Td> <Td> Eritrea, Ethiopia </Td> <Td> 0.2 </Td> <Td> </Td> </Tr> <Tr> <Td> Sidama </Td> <Td> Afro - Asiatic, Cushitic </Td> <Td> Sidama </Td> <Td> Horn of Africa </Td> <Td> Ethiopia </Td> <Td> </Td> <Td> </Td> </Tr> <Tr> <Td> Somali </Td> <Td> Afro - Asiatic, Cushitic </Td> <Td> Somali </Td> <Td> Horn of Africa </Td> <Td> Somalia, Ethiopia, Djibouti and Kenya </Td> <Td> 21 </Td> <Td> </Td> </Tr> <Tr> <Td> Tigrayan </Td> <Td> Afro - Asiatic, Semitic </Td> <Td> Tigrinya </Td> <Td> Horn of Africa </Td> <Td> Ethiopia, Eritrea </Td> <Td> 9.3 </Td> <Td> </Td> </Tr> <Tr> <Td> Tigre </Td> <Td> Afro - Asiatic, Semitic </Td> <Td> Tigre </Td> <Td> Horn of Africa </Td> <Td> Eritrea, Sudan </Td> <Td> 1.5 </Td> <Td> </Td> </Tr> <Tr> <Td> Tigrinya </Td> <Td> Afro - Asiatic, Semitic </Td> <Td> Tigrinya </Td> <Td> Horn of Africa </Td> <Td> Eritrea </Td> <Td> 3.4 </Td> <Td> </Td> </Tr> <Tr> <Td> Welayta </Td> <Td> Afro - Asiatic, Omotic </Td> <Td> Wolaytta </Td> <Td> Horn of Africa </Td> <Td> Ethiopia </Td> <Td> </Td> <Td> </Td> </Tr> </Table> <Tr> <Th> Name </Th> <Th> Family </Th> <Th> Language </Th> <Th> Region </Th> <Th> Country </Th> <Th> Population (million) </Th> <Th> Notes </Th> </Tr> <Tr> <Td> Afar </Td> <Td> Afro - Asiatic, Cushitic </Td> <Td> Afar </Td> <Td> Horn of Africa </Td> <Td> Ethiopia, Djibouti, Eritrea </Td> <Td> 2.5 </Td> <Td> </Td> </Tr>

What are the four ethnic groups in africa