Ancient maps show islands that don't really exist

The fictional island Frisland appears in the lower left corner of this 1596 map of the Arctic

by Gerardus Mercator.

Image courtesy of the Osher Map Library and Smith Center for Cartographic Education at the University of Southern Maine

From National Geographic by Greg Miller

For centuries, mapmakers have conjured up islands that only exist in the imagination.

The treaty that drew the first borders of the newly established United States after the Revolutionary War refers to an island that does not exist.
The northern boundary of the new nation, the 1783 Treaty of Paris declared, shall pass “through Lake Superior northward of the Isles Royal and Phelipeaux.”
It sounds clear enough, but when surveyors went out to map the border in the 1820s they discovered a problem: Isle Phelipeaux was not there.

The story behind the nonexistent island Brasil, shown on this 1633 map in the Atlantic Ocean west of Ireland (far left), is a mystery.

The long and fascinating history of such phantom islands is the topic of Malachy Tallack’s new book, The Un-Discovered Islands, which he discussed recently in an interview with National Geographic. Inspired by the book, we’ve rounded up a collection of vintage maps that feature islands that don’t actually exist.

Saint Brendan, an early Christian monk, is the namesake of a nonexistent island in the North Atlantic (right of center, near the top). 

He’s also reputed to have held mass on the back of a whale, as shown on this 1621 map.

“Frisland,” for example, appears to have been the invention of a wealthy Venetian named Niccolò Zeno, who wrote a book in 1558 claiming that his ancestor had discovered the New World before Columbus.

This detail from a 1558 map that accompanied Niccolò Zeno’s dubious book, in which he claimed that his ancestor discovered the New World before Colombus, shows the faux island of Frisland (left of center, near the bottom).

Historians now consider the claim bogus, but it was influential at the time, and the islands it described appeared on maps for more than a century.

Gerhard Mercator included a circular inset map of Frisland, complete with several nonexistent towns, on his 1595 map of the region around the North Pole.

This was, after all, the era when people were just beginning to explore the world’s oceans, and news traveled slowly by modern standards.

This 1720 map shows the mythical island of Thule, first reported by the Greek explorer Pytheas around 330 B.C., off the north coast of Scotland and in the inset at top left.

Some islands were believed to have existed and later sunk. Sarah Ann Island, a speck of land in the Pacific Ocean claimed by the United States under the 1856 Guano Act, a law permitting the appropriation of islands covered with bird droppings (a valuable source of fertilizer at the time).
The island happened to be in the path of a total solar eclipse in 1937, but when astronomers went to seek it out, the island was gone.
Most likely it had never been there, but newspapers reported that it had sunk, and the rumor stuck.

For centuries, mapmakers drew California as an island, as in this Dutch map from 1689.

Other “un-discovered” islands, like Phelipeaux, appear to be the result of outright fraud.
This island appears on a map by a Virginia-born British loyalist named John Mitchell that was used by both sides to negotiate the Treaty of Paris (see below).

 Four nonexistent islands are visible in this detail from John Mitchell’s map: Phelippeaux, Pontchartrain, Maurepas, and St. Anne.

Mitchell isn’t at fault for the faux island, however.
He simply copied the island from an older map.
The island’s name, together with the names of three other nonexistent Lake Superior islands, Pontchartrain, Maurepas, and St. Anne, betray the origin of the ruse.
In the 1720s, a count named Jean-Frédéric Phélypeaux had served as a French secretary of state.
He happened to have estates named Pontchartrain and Maurepas, and his family’s patron saint just happened to be St. Anne.
Apparently, someone was kissing up to the count by inventing islands named in his honor.
The sycophant appears to have been an explorer named Pierre François Xavier de Charlevoix, whose voyages in the region had been funded by the good count Phélypeaux.
The four imaginary islands first appear on a map commissioned for a book published by Charlevoix in 1744.
The fraud went undetected for nearly a century until another treaty finally erased them from maps for good in 1842.
“This little lie that an explorer told became entangled in a really important part of history,” Tallack says.
“I find that really fascinating.”

Sandy Island, which appears in the top left corner of this 1921 National Geographic map, was “un-discovered” once and for all in 2012.

 The same 1921 map depicts Morell Island, which doesn’t appear on modern maps, at the far northwest end of the Hawaiian Island chain.

One of the most recent island un-discoveries happened in 2012, when an Australian research vessel reported that Sandy Island, which maps depicted off the coast of New Caledonia in the South Pacific, was most definitely not there.
Within weeks the National Geographic Society announced that Sandy Island would be stricken from all of its maps, and other mapmakers followed suit.
Google removed Sandy Island from its maps, too, but people continued to post photos at its former location.
The photos were mostly meant as a joke, Tallack says, but they also hint at the powerful pull islands exert on the human imagination.
“Because their borders are well defined we can project our ideas onto them much more easily than we can with other places.”

Links :

• GeoGarage blog : These imaginary islands only existed on maps /Why ancient mapmakers were terrified of blank spaces /South Pacific Sandy Island 'proven not to exist' / Mystery of the phantom islands solved: Lands that ... / Hy-Brasil, the other Atlantis / Lost Islands: the story of Islands that have vanished ... / About the Null island at 0°0'0" N 0°0'0" E