Consag's map is one of the cornerstone maps of California history.
The map was engraved by Joseph Gonzales, to illustrate Consag's report on his expedition to the mouth of the Colorado River in 1746, and represents 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. The map was issued in the Madrid edition of Venegas' Noticia de la California, y de su conquista temporal, y espiritual hasta el tiempo presente in 1757.
While the book occassionally appears on the market, there are no recorded examples of the Consag map appearing in either a dealer catalogue or at auction in the past 25 years.