Polilio Island is located on the northeastern side of Quezon Province. Located just before the entrance to the cave of Polillo town, Polilio Coral Reef has a length of about five kilometers and a width of about two kilometers. It is also a good spot for snorkeling and diving. Some parts are so shallow that any type of ship and banca will have to make a detour to avoid the reef area. Some parts have so-called walls which are more than a hundred feet deep.