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A woodcut circular world map from the 1492 Venice edition of Macrobius’ In Somnium Scipionis expositio. A fifth century Neoplatonist, Macrobius considered the earth to be divided by ocean currents into four large islands, of which two were in southern hemisphere. This zonal map of the ‘old’ world portrays the polar frigid zones and the temperate zones divided by torrid or “burning” zones flanking the “Alveus Oceani”, the equatorial ocean.