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Where the map stops: Delisle leaves Africa blank

Our 1730 map of Egypt and Arabia descends from the plate that erased the mythical source of the Nile.

For two thousand years, European maps drew the source of the Nile as a pair of lakes fed by the 'Mountains of the Moon' — a geography inherited from Ptolemy and repeated, unquestioned, by mapmaker after mapmaker.

Guillaume Delisle, the most rigorous geographer of his age, broke the habit. On his landmark Paris map of 1718 he simply erased the mythical lakes and left the African interior blank where no traveller had reported. It was a radical statement: that a map should show only what is actually known, and that an honest emptiness is worth more than a confident fiction.

This 1730 sheet of Egypt, Nubia and Arabia, reissued in Amsterdam by the prolific house of Covens & Mortier, descends directly from that plate. To a modern eye the blank spaces look like ignorance. In fact they are the moment cartography grew up.

Sources: David Rumsey Map Collection ↗

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