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1 day ago · Africa. Africa is the world's second-largest and second-most populous continent after Asia. At about 30.3 million km 2 (11.7 million square miles) including adjacent islands, it covers 20% of Earth 's land area and 6% of its total surface area. [ 7] With nearly 1.4 billion people as of 2021, it accounts for about 18% of the world's human ...