Guimaras as an island is made up entirely of limestone and this type of soil or rock is a porous one, meaning it absorbs a lot of water. What significant is that the water mostly absorbed by the limestone base of Guimaras is salt which is more corrosive than fresh water.

Buenaflor, L.M., Jr. (2016, June 24). Is Guimaras sinking ?. Panay News, p. 8.