Meaning literally "resting place of mantas", this island is 23 km east of Balicasag and as the name suggests, you may be lucky enough to find yourself swimming with one of these creatures. There is a marine sanctuary on the northwestern side and coral formations, together with anemones, sea fans and sponges are particularly impressive.
Another site, Cervera Shoal, is quite often combined with an outing to Pamilacan. It is a sunken island with a sea mount rising to 15m. There is a colony of banded sea snakes here, leading to its other name, "Snake Island". Corals are not so good, but large pelagics more than make up for this. Regular visitors include whitetip sharks, butterflyfish, scorpionfish and surgeons.