Gasan, officially the Municipality of Gasan (Tagalog: Bayan ng Gasan), is a 3rd class municipality in the province of Marinduque, Philippines. According to the 2020 census, it has a population of 36,197 people.[4]


The municipality is bounded by the provincial capital, Boac, to the north and east, by Buenavista to the southeast and by the Sibuyan Sea to the south and west. It is the second-oldest municipality in Marinduque, after Boac. Residents of Gasan are called Gaseños. Gasan is 16 kilometres (9.9 mi) from Boac.

The Tres Reyes Islands off the coast of Marinduque are under the jurisdiction of Gasan, part of the municipality's Barangay Pinggan.


The origin of the name of Gasan came from the term Gasang or Gasang-Gasang, a type of coral once abundant around the town's shoreline. Legend has it that when the Spaniards discovered the town, they found an old woman near the banks of today's Matandang Gasan River. When asked in Spanish what was the name of the town, she interpreted it as if they were asking about what was the name of the corals growing around the area, with the Spaniards interpreting her answer as the name of the town. Over time, the term Gasang-Gasang was shortened to Gasang before being shortened further to Gasan.


SKYLINE OF GASAN