The Cartographer's Mistake

Early mapmakers operated in a ruthless, copyright-free economy where notes were easily stolen and rival publishers profited from your travels. To catch a thief, some cartographers resorted to a clever form of cartographic watermarking: they intentionally drew phantom islands that did not exist. If a competing map appeared featuring the exact same nonexistent landmass, the original creator had undeniable proof of theft.

Not all imaginary geography was forensic. Some islands were deliberately falsified to protect valuable trade routes and dissuade enemies from navigating specific waters, while others were born from simple misinterpretation. The Baja California Peninsula was famously mapped as an island for over a century, and Pepys Island turned out to be nothing more than a misidentified Falkland archipelago.

Then there were the grand theoretical errors, like the Mountains of Kong, a fictitious African range that persisted on maps for decades simply because mapmakers struggled to reconcile observed river flows with their preconceived notions of the continent's geography. When information was scarce, geography had to be invented to make the math work.

These phantom lands occupied a curious netherworld between fact and fiction, rooted far more in a subjective or psychological understanding of space than in material evidence. On a flat map, even mathematical tools like the Mercator projection warp the physical world to serve a specific purpose, prioritizing navigational direction over actual size. A map has never been a mirror of the earth; it is an argument about what might be out there in the dark.