Municipality of Gasan, Marinduque

Gasan is a 3rd class municipality in the province of Marinduque, Philippines. According to the 2007 census, it has a population of 33,772 people. The municipality is bounded by the provincial capital, Boac, to the north and east, by Buenavista to the southeast and by the Tablas Strait to the south and west. It is the second-oldest municipality in Marinduque, after Boac. Residents of Gasan are called Gaseños.