Eurasia is a large lanmass covering roughly 53,990,000 km² which is 10.6% of the surface of the Earth and 36.2% of its total land area. Sometimes considered a single continent, Eurasia comprises the geo-political areas of Europe and Asia, concepts which date back to classical antiquity with somewhat arbitrary borders. Eurasia, in turn, is part of the yet larger landmass of Afro-Eurasia, as Eurasia is joined to Africa at the Isthmus of Suez.