Horn of Africa displays the greatest diversity, a sign often viewed to represent a geographic origin. The Horn of Africa is also the place where the haplogroup E1b1b originated from, Christopher Ehret and Shomarka Keita have suggested that the geography of the E1b1b lineage coincides with the distribution of the Afroasiatic languages. Genetic analysis done on the Afroasiatic speaking population further found that a pre-agricultural back-to-Africa migration into the Horn of Africa occurred through Egypt 23,000 years ago and it brought a non-African ancestry dubbed Ethio-Somali in the region. Together with northern Somalia, Djibouti, the Red Sea coast of Sudan and Eritrea is
Operation Enduring Freedom – Horn of Africa Horn of Africa, Gulf of Aden, Red Sea, North Arabian Sea and the Gulf of Oman. On 21 January 2006, , an "Arleigh Burke"-class destroyer, captured a vessel operating off the Somali coast whose crew were suspected of piracy. On 18 March 2006, , a "Ticonderoga"-class cruiser and , an "Arleigh Burke"-class destroyer, engaged pirate vessels after receiving fire from them. On 3 June 2007, , a landing ship dock, engaged pirates attacking a freighter, but failed to repel them. On 28 October 2007, the destroyer , opened fire on pirates who had captured a freighter and with other vessels