An ichthyocentaur (parts human, horse and fish) plays a viol on a map of Scandinavia from the 1573 edition of Ortelius’s Theatrum orbis terrarum. The sea surrounding Scandinavia showed sailing ships and this traditionally peaceful ichthyocentaur, perhaps suggesting safe passage.
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Mythical Creatures on Maps

Flemish cartographer Abraham Ortelius, first published in 1570. Reprinted with permission by British Library and the University of Chicago Press.