California was an island? - 🌎 With El Mapa de Sebas

Hundreds of maps show California and Baja California as an island. Why? Was it really separate or was it the biggest mapping error in history?
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TO KNOW MORE:
The Island of California: en.wikipedia.o...
18 maps from when the world thought California was an Island: www.wired.com/...
First opinion of Fray Antonio de la Ascención on the expedition to discover and colonize California in Valladolid, Mexico. May 20, 1629.
Fray Antonio de la Ascención and Juan Vizcaíno. dialnet.unirio...
California as an Island. An Illustrated Essay by John Leighly. The Book Club of California. San Francisco. 1972.
Screenplay: Tonatiuh Moreno
Illustrations:
Sofia Espinosa / miss_sofyjones
Voice: Javier Lacroix / javierlacroix
Music: Miguel Solís, Mary Camarena and Jorge Verdín
Animation:
Alejandra Espinosa / alepan_ca
Editing: Erick Blackmer www.imdb.com/n...