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Early map of the coastline from San Blas, New Spain, north to Cabo Mendocíno, Alta California.
Under orders from Don Jose de Gálvez, between 1768 and 1770, Miguel Constanzó explored the coastline of the California (Baja) Peninsula and Alta California with a two-fold purpose: 1) to correct existing navigational charts, and 2) to investigate and develop plans for the ports of San Diego and Monterey. He was also directed, if possible, to investigate the San Francisco Bay region and develop plans for that area too. His explorations resulted in four maps that included a plan focused on the coastal region around the Channel of Santa Bárbara. The map roughly depicts the coastline from San Blas, New Spain, north to Cabo Mendocíno, Alta California as reflected by the lack of detail surrounding either the Monterey Bay or San Francisco Bay.
Archivo General Militar de Madrid, Spain
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"1769 - Plano de la Costa del Sur corregido hasta la Canal de Santa Barbara" (2017). Pre-1824 Maps. 51.