Seno de California, y su costa oriental nuevamente descubierta, y registrada desde el Cabo de las Virgenas, hasta su termino, que es el Rio Colorado ano 1747…


Consag’s seminal map of California which conclusively ended the classic cartographic myth that California was an island.

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Cornerstone map of California history, issued to illustrate Fernando Consag’s report on his expedition to the the head of the Gulf of California in 1746. Along with other members of the Society of Jesus from Baja California, Consag rowed up to the mouth of the Colorado River in canoes, confirming Father Eusebio Kino’s assertion that Baja was a peninsula.

In his text, Consag relates: “It was evident, beyond all possibility of doubt, that California is a peninsula, joining the continent of New Spain; and that the extremity of the gulf, is the river Colorado, which divides the former from the latter.”

But it was this map, which was issued in Venegas’ Noticia de la California, that represented the final chapter in dispelling the myth of California as an island. While Kino had offered strong evidence that California was not an island, he did not cross the Colorado River, and therefore his theories were rejected by some explorers and authorities, until Consag’s crossing of the Colorado and exploration of the upper part of the Sea of Cortez.