The name Boac was derived from the Tagalog word “biak” which means divided. The river which ran from the eastern hinterland to the western plains down to the sea, had divided the town into two areas, the Northern Area and the Southern Area. The people used to say “Ang Bayang Biak”. In the course of time, by means of verbal intercourse and communication and other exchange of letter and notes between the people of Marinduque and Mindanao, the Tagalog word "biak" becomes Boac, the name which has persisted up to the present.
Boac is the provincial capital of Marinduque and has a population of 60,777 people according to the 2010 census. It has politically subdivided into 61 administrative divisions called barangays. Approximately 137 nautical miles by the shortest routes from Manila and 45 minutes flight from Manila Domestic Airport to Masiga Airport in Gasan which is seven kilometers from Boac.
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