Which ethnic groups are the largest in Djibouti?

The two largest ethnic groups in Djibouti are the Somali and the Afar. Both groups speak related, though not mutually intelligible, Cushitic languages.312

The Somali population is primarily concentrated in the capital city and the southeastern part of the country. Within this group, more than half belong to the Issa clan, whose total numbers exceed those of the Afar. The remaining Somali population consists largely of members of the Gadaboursi and Isaaq clans.312

The Afar, also known as the Denakil or Danakil, reside primarily in the sparsely populated regions to the north and west of the Gulf of Tadjoura.31