Africa is the world's second-largest and second-most-populous continent. At about 30.
2 million
km2 (11.7 million sq mi) including adjacent islands, it covers six percent of Earth's total surface
area and 20.4 percent of its total land area.[2] With 1.1 billion people as of 2013, it accounts for
about 15% of the world's human population.[3] The continent is surrounded by the Mediterranean
Sea to the north, both the Suez Canal and the Red Sea along the Sinai Peninsula to the northeast,
the Indian Ocean to the southeast, and the Atlantic Ocean to the west. The continent includes
Madagascar and various archipelagos. It has 54 fully recognized sovereign states ("countries"),
nine territories and two de facto independent states with limited or no recognition.[4]
Africa's population is the youngest among all the continents; 50% of Africans are 19 years old or
younger.[5]
Algeria is Africa's largest country by area, and Nigeria by population. Africa, particularly central
Eastern Africa, is widely accepted as the place of origin of humans and the Hominidae clade
(great apes), as evidenced by the discovery of the earliest hominids and their ancestors, as well as
later ones that have been dated to around seven million years ago, including Sahelanthropus
tchadensis, Australopithecus africanus, A. afarensis, Homo erectus, H. habilis and H. ergaster
with the earliest Homo sapiens (modern human) found in Ethiopia being dated to circa 200,000
years ago.[6] Africa straddles the equator and encompasses numerous climate areas; it is the only
continent to stretch from the northern temperate to southern temperate zones.[