Entry Point for most visitors to Marinduque, Balanacan Harbor is rich in history just by itself.
It has always been recognized as a place of refuge for shipping because of it's sheltered
harbor.  It was known to the Spanish and the first Americans as Port San Andres as well as
1864 Spanish survey map below
U. S. Survey 1908
Balanacan -Boac Road Survey
From the Sixth Annual Report of the Philippine Commission 1905, Bureau of Insular
Affairs, War Department.  Appendix B, Annual Report of the Bureau of Engineering
Port Balanacan
From the United States Coast Pilot, Philippine Islands, Part 1 1919
The Balanacan Station defined the origin of the Luzon
Datum of 1911. All surveys in the Philippines were
corrected and based on the position of this station.
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On November 25, 1944, Bombing Squadron Eighteen (VB-18) flying SB2C-1 & SB2C-1C
Planes from the United States Carrier Intrepid (CV-11) were responsible for destroying the
Japanese fast transports T.6 and T.10, and damaging fast transport T.9 and the escort
destroyer Take, at Balanacan Harbor.  
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