A diving strip on the Calumpan Peninsula of Mabini, Batangas, on Luzon's Verde Island Passage — widely regarded as the muck-diving and underwater-macro-photography capital of the Philippines. With 40-plus shore- and boat-accessible sites and a critter list spanning hundreds of nudibranch species, frogfish, flamboyant cuttlefish and rare octopus, Anilao draws photographers year-round.
Destination info
Conditions, highlights, and the resident marine life.
Conditions
Water and air temperature across the year.
WaterAirDryShoulderWet
Description
Anilao refers to a cluster of dive resorts along the southwestern Calumpan (Mabini) Peninsula in Batangas Province, southern Luzon, wedged between Balayan Bay to the west and Batangas Bay to the east. The peninsula sits squarely in the Verde Island Passage, the narrow strait between Luzon and Mindoro that a 2005 study by Carpenter and Springer identified as 'the center of the center' of marine shorefish biodiversity. The same nutrient-rich currents that feed that biodiversity make Anilao a critter-hunter's paradise: more than 40 dive sites — most within a 5-to-30-minute boat ride, several divable straight from shore — range from black-sand muck slopes and rubble fields to coral-covered pinnacles and small walls. It is the macro and muck capital of the Philippines, famous as a 'nudibranch capital' (operators commonly cite several hundred recorded species), and a leading destination for blackwater diving, a night technique pioneered locally that suspends a lit line in open water to attract larval and pelagic critters. Most dives run 5–30 m with generally mild currents, making the area accessible to a wide range of experience levels, though a handful of seamount and current-swept sites suit more experienced divers. Diving is best in the dry season (roughly November–May), when seas are calm and visibility peaks; the nudibranch and critter peak is often cited as autumn through spring. Several sites lie inside the Mabini–Tingloy protected seascape and long-standing marine sanctuaries (Twin Rocks, Cathedral Rock, Arthur's Rock).
Highlights
What makes this dive worth the trip.
Anilao sits at the heart of the Verde Island Passage, the strait between Luzon and Mindoro that a 2005 study by Kent Carpenter (IUCN/Old Dominion University) and Victor Springer (Smithsonian) documented as the global peak of marine shorefish biodiversity — 'the center of the center' — making it one of the most species-rich waters on Earth.
Anilao is regarded as the macro and muck-diving capital of the Philippines and is frequently called a 'nudibranch capital,' with operators citing several hundred recorded nudibranch species across its sites — alongside frogfish, ghost pipefish, seahorses, and rare cephalopods.
Anilao is one of the world's leading destinations for blackwater diving — a night technique, pioneered locally by Crystal Blue Resort's team, in which a weighted line is suspended from a float with lights set roughly 10 m apart to attract larval, juvenile, and pelagic deep-water creatures rarely seen elsewhere.
Marine life
53 species you’re likely to encounter on a dive here.
Dive sites
6 signature sites at this destination.
Cathedral Rock
One of Anilao's best-known sites, inside a marine sanctuary off Bagalangit: two large mounds with a cross planted between them (placed by former President Fidel V. Ramos), forming an open, roofless 'cathedral.' Depths range from about 12 to 18 m on the main feature down to around 30 m, with no to mild-moderate current, making it an easy dive suitable for beginners with a guide. Decades of controlled fish feeding have made it unusually fish-rich — angelfish, butterflyfish, wrasse, surgeonfish, snappers and jacks — alongside frogfish, moray eels, lionfish, turtles and a strong nudibranch list.
12–30 mbeginnerDay boatLightVisibility 10–20 m
Anilao Pier
A classic shore-accessible muck and macro site beneath and around a jetty, best known as a dusk and night dive. The structure and surrounding sand and rubble shelter a dense critter community — worms, shrimps, small fish drawn to dive lights, hairy frogfish, mimic octopus, nudibranchs and other macro subjects — making it a favourite for photographers wanting an easy, current-free critter dive.
2–18 mbeginnerShoreLightVisibility 3–10 m
Kirby's Rock
A seamount/wall site on the more exposed outer coast, often cited as one of Anilao's most dramatic dives, descending steeply from the shallows to around 30 m. Stronger seasonal currents sweep nutrients past the wall, drawing schooling jacks and giant trevally with occasional encounters at depth; the wall and slope are draped in black coral trees, sea fans and sponges with thick nudibranch colonies on the shallower stations. Best suited to more experienced divers when current is running.
5–35 madvancedDay boatModerateVisibility 8–20 m
Sombrero Island
A reef site around the small hat-shaped island off Maricaban/Tingloy, about a 15–30 minute boat ride south of the Anilao resorts and facing the Verde Island Passage. Topography of gentle walls and slopes runs from roughly 5 to 25 m, carpeted in soft and hard corals (including patches of orange Tubastraea cup coral) with good fish life; turtles and a variety of reef fish are regular, and the more exposed reef can carry current. A scenic wide-angle and coral site that contrasts with the muck dives closer to shore.
5–25 mintermediateDay boatModerateVisibility 10–20 m
Secret Bay (Mainit Muck)
Anilao's signature muck site, a black-sand and rubble slope near Mainit Point that is one of the most productive critter dives in the Philippines. Depths run roughly 3–20 m over volcanic sand, and visibility is often low — rarely much above 5 m on the silty inner sections — which is exactly the habitat that concentrates macro life. Daytime and especially night dives turn up hairy frogfish, ghost pipefish, mimic and wonderpus octopus, flamboyant cuttlefish, blue-ringed octopus, mantis shrimp, seahorses and dense nudibranch life.
3–20 mbeginnerDay boatLightVisibility 3–12 m
Twin Rocks
Two coral-covered boulders/pinnacles on the southern end of the peninsula inside a long-established marine sanctuary within the Mabini–Tingloy protected seascape. Depths run from about 5 to 21 m with generally mild to moderate current, suiting all levels. The protected reef holds dense schools of jacks and anthias, anemones with clownfish, a resident hawksbill turtle, blue ribbon eels and abundant nudibranchs, with macro critters in the sandy patches between coral heads.
5–21 mbeginnerDay boatLightVisibility 10–18 m
Where to dive & stay
Local dive centers, resorts, and hotels.
Featured operators coming soon
Verified dive centers, resorts, and hotels around Anilao will list here — pricing, photos, and direct contact.
