Ethiopia is a landlocked country located in the Horn of Africa, and officially known as the Federal Democratic Republic of Ethiopia. It is the second-most populous nation in Africa, with over 85.2 million people, and the tenth-largest by area, with its 1,100,000 km2. The capital is Addis Ababa. Ethiopia is bordered by Eritrea to the north, Sudan to the west, Djibouti and Somalia to the east, and Kenya to the south. Ethiopia was a monarchy for most of its history, and the Ethiopian dynasty traces its roots to the 2nd century BC. Ethiopia is also one of the oldest sites of human existence known to scientists today, having yielded some of humanity's oldest traces. It may be the region from which Homo sapiens first set out for the Middle East and points beyond. When Africa was divided up by European powers at the Berlin Conference, Ethiopia was one of only two countries that retained its independence. It was one of only four African members of the League of Nations. After a brief period of Italian occupation, Ethiopia became a charter member of the United Nations. When other African nations received their independence following World War II, many of them adopted the colors of Ethiopia's flag, and Addis Ababa became the location of several international organizations focused on Africa.