Eritrea ĕrĭtrē´ə [key], officially State of Eritrea, republic (2005 est. pop. 4,562,000), c.48,000 sq mi (124,320 sq km), NE Africa. It is bordered on the northeast by the Red Sea, on the southeast by Djibouti, on the south by Ethiopia, and on the northwest by Sudan. Eritrea also includes the many