Ulloa and Alarcón were the first to determine that Baja California was a peninsula and not an island, as had been supposed at the time of its initial discovery. Upon Alarcón's return to New Spain in 1541 he prepared a more accurate [[map]] of California depicting it correctly as a peninsula. Subsequent sixteenth century maps accepted these findings, the notion of the Island of California arose again in the seventeenth century and persisted on many European maps well into the eighteenth century. | Ulloa and Alarcón were the first to determine that Baja California was a peninsula and not an island, as had been supposed at the time of its initial discovery. Upon Alarcón's return to New Spain in 1541 he prepared a more accurate [[map]] of California depicting it correctly as a peninsula. Subsequent sixteenth century maps accepted these findings, the notion of the Island of California arose again in the seventeenth century and persisted on many European maps well into the eighteenth century. |