| BALANACAN HARBOR |
| 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 Banacalan |

| 1864 Spanish survey map below |

| U. S. Survey 1908 |






| 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. Click Here |


| 1782 Capt Brereton |
