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Scarce early map of the Baja Peninsula, from San Diego to Cabo San Lucas, along with the Gulf of California, extending Valle de Banderas Bay.

The map provides excellent coastal details, including topography and coastal place names.

The map is based upon the work of Commander George Dewey, U.S.N., and later Admiral Dewey, who surveyed the Gulf of California on the U.S.S. Narragansett and visited the mouth of the Colorado River to investigate its navigability.