The Horn of Africa (alternatively Northeast Africa, an sometimes Somali Peninsula) is a peninsula in East Africa that juts for hundreds of kilometers into the Arabian Sea, and lies along the southern side of the Gulf of Aden. It is the easternmost projection of the African continent. The term also refers to the greater region containing the countries of Eritrea, Djibouti, Ethiopia and Somalia. As such, it covers approximately 2,000,000 km² (772,200 sq mi) and is inhabited by about 90.2 million people (Ethiopia: 75 million, Somalia: 10 million, Eritrea: 4.5 million, and Djibouti: 0.7 million).