Island of California
A centuries-old cartographic error depicting California as an island.
For centuries, a widespread error persisted: California was not attached to the North American mainland but was instead a large island, separated by what we now call the Gulf of California. This cartographic mistake, one of history’s most famous, appeared on countless maps throughout the 1600s and 1700s, even as explorers brought back evidence to the contrary. The myth was originally tied to the idea of California as a kind of earthly paradise—like Eden or Atlantis—inhabited solely by Amazon-like women and guarded by griffins.
The legend first appeared in a 1510 romance novel, *Las sergas de Esplandián*, by Garci Rodríguez de Montalvo. It described an island called California, located near the Terrestrial Paradise, populated by black women living without men, much like the Amazons. Because this book was hugely popular when Europeans began exploring the region, many believe it inspired the naming of California and led early explorers to mistake the Baja California peninsula for that mythical island.
In 1533, a mutineer named Fortún Ximénez, part of an expedition sent by Hernán Cortés, discovered the southern tip of Baja California near modern-day La Paz. He was killed by locals, but his men returned to New Spain with the news. Cortés himself arrived in 1535, named the area Santa Cruz, and tried to start a colony, but abandoned it after a few years due to supply problems. His limited knowledge of southern Baja California likely led to the region being named after the legendary island and to a brief assumption that it was indeed an island.
In 1539, Cortés sent navigator Francisco de Ulloa to explore the Gulf and Pacific coasts of Baja California. Ulloa reached the mouth of the Colorado River at the head of the Gulf, which strongly suggested the land was a peninsula, not an island. He described the region as “high and bare, of wretched aspect without any verdure.” Another expedition under Hernando de Alarcón went up the lower Colorado River and confirmed Ulloa’s findings. As a result, 16th-century European maps—including those by Gerardus Mercator and Abraham Ortelius—correctly showed Baja California as a peninsula.
The error didn’t spread because many cartographers independently made the same mistake; rather, it was due to copying. The first maps showing California as an island appeared *after* a series of correct maps.
- Type
- Cartographic misconception
- First known mention
- 1510 romance novel Las sergas de Esplandián
- Period of belief
- Mid-1500s to late 1700s
- Earliest known island map
- 1603 by Carmelite friar Antonio de la Ascensión
- Largest collection
- Stanford's Glen McLaughlin Collection, over 1,000 maps
- Key propagation method
- Uncritical repetition and copying of maps
Lore & Background
The first known mention of the legend of the Island of California was in the 1510 romance novel Las sergas de Esplandián by Garci Rodríguez de Montalvo. He described an island called California, very close to the Terrestrial Paradise, peopled by black women living in the manner of Amazons. It is thought that the book's popularity inspired the naming of California and prompted early explorers to misidentify the Baja California peninsula as the island in these legends. In 1533, Fortún Ximénez discovered the southern portion of Baja California, and in 1535 Hernán Cortés arrived there, naming the area Santa Cruz, but abandoned his colony after several years. In 1539, Francisco de Ulloa reached the mouth of the Colorado River, which seemed to prove the region was a peninsula, and maps by Gerardus Mercator and Abraham Ortelius correctly showed Baja California as a peninsula.
Reader's Guide
The Island of California misconception persisted for over two centuries, from the mid-1500s to the late 1700s, despite multiple expeditions providing evidence to the contrary. The error was perpetuated through uncritical repetition and copying of maps, particularly after Carmelite friar Antonio de la Ascensión depicted California as an island in 1603. His map was confiscated by Dutch pirates, leading to Dutch maps depicting California as an island, which then spread to other European cartographers. The belief was reinforced by reports from Juan de Oñate's overland expedition and Nicolás de Cardona's voyage, which claimed to see the Gulf extending northward, possibly due to a superflood. The misconception was not resolved until further exploration in the late 1700s, and it remains one of the most famous cartographic errors in history, with over 1,000 maps in Stanford's Glen McLaughlin Collection documenting the error.
Did You Know?
- Carmelite friar Antonio de la Ascensión was the first known person to depict California as an island in 1603.
- A British map from 1630 includes a note that the island depiction came from a Spanish chart taken from Hollanders.
- Stanford's Glen McLaughlin Collection contains over 1,000 maps of California as an island, the largest such collection in the world.
Frequently Asked Questions
What is the 'Island of California'?
It is a centuries-old cartographic error in which California was drawn as a standalone island rather than a peninsula attached to the North American continent. The mistake appeared on maps for roughly two hundred years, from the mid-1500s through the late 1700s.
Where does the Island of California myth originate?
The idea traces back to a 1510 Spanish romance novel, Las sergas de Esplandián, which described a fantastical island paradise. That literary invention was later seized upon by mapmakers and recast as a geographic 'fact.'
How long did people actually believe California was an island?
The misconception held sway from roughly the mid-1500s until the late 1700s, persisting even after explorers had gathered clear evidence of a land connection. The earliest known map depicting it as an island dates to 1603, produced by Carmelite friar Antonio de la Ascensión.
Why did the island error persist for so many decades?
The primary driver was that cartographers routinely copied one another's existing maps without independently verifying the underlying geography. This chain of uncritical reproduction allowed the mistake to propagate across generations of mapmakers and into collections like Stanford's Glen McLaughlin Collection, which holds over a thousand such maps.
What was the original fantasy behind the Island of California legend?
In its earliest literary form the island was envisioned as an earthly paradise akin to Eden or Atlantis, populated exclusively by Amazon-like warrior women and defended by griffins. That romantic, almost mythological vision is what gave the geographic error its lasting cultural grip well beyond the age of exploration.
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