Check out this map of the Arctic from the 16th century. There are four major land masses surrounding a polar sea with a massive magnetic rock in the center, called Rupes Nigra the Latin words for Black Rock.

Book Sources

“The Phantom Atlas” Edward BrookeHitching
"Half Moon" Douglas Hunter
"A New World Voyager" Edward Butts

RareMaps.com Sources

1596 Geradus Mercator Arctic Map https://www.raremaps.com/gallery/deta...
1590 Petrus Plancius World Map https://www.raremaps.com/gallery/deta...
1570 Ortelius First World Atlas https://www.raremaps.com/gallery/deta...

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