The Rupes Nigra ("Black Cliff"), a phantom island, was believed to be a black rock located at the North Magnetic Pole or at the geographic North Pole itself. Described by Gerardus Mercator as 33 French miles in size, it provided a supposed explanation for why all compasses point to this location.
The Rupes Nigra ("Black Cliff"), a phantom island, was believed to be a black rock located at the North Magnetic Pole or at the geographic North Pole itself. Described by Gerardus Mercator as 33 French miles in size, it provided a supposed explanation for why all compasses point to this location.
Source: Wikipedia "Rupes Nigra" · CC BY-SA 4.0
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