The Horn of Africa consists of the internationally-recognized countries of Djibouti, Eritrea, Ethiopia and Somalia, as well as Somaliland, an unrecognized sovereign state that is internationally considered to be part of Somalia. It covers approximately two million square kilometers (770,000 square miles) and is inhabited by roughly 115 million people (Ethiopia: 96.6 million, Somalia: 15.4 million, Eritrea: 6.4 million, and Djibouti: 0.81 million). In ancient and medieval times, it was known in the Western world as the "land of the "Barbaria" and Ethiopians". Regional studies on the Horn of Africa are carried out in fields such as Ethiopian studies and Somali studies.