An attractive manuscript map of the region of Guaymas, Sonora, Mexico executed in the year that the town was founded. Guaymas is the second largest port on the Pacific Coast of Mexico. The area was first explored by teh Spanish in 1535. Juan Maria de Salviatierra, a Jesuit protege of Father Francisco Eusebio Kino, founded a mission at Guaymas about 1700. The R. Sonora is shown with the mission station of Guaymas at its mouth, the region is supported by three further rivers feeding into the Mar de la California. Numerous further missions are dotted around the map. From the collection of the Marques de Pidal (1846-1913) who was an active book collector, politician and philanthropist whose collection remained with the family until the early 1960s.