Cathedral Rock
13.7245°N 120.8770°E · reef
Cathedral Rock is a reef dive site in Bagalangit, Mabini, built around two massive rocky outcrops where coral transplantation transformed a once-barren formation into a thriving marine sanctuary, now anchored by a large cement cross and exceptional nudibranch diversity.
Overview
The site takes its name from the way light filters down between two large rock formations, creating an underwater amphitheatre-like space resembling an open-air cathedral. Early in Anilao’s diving history, conservationists transplanted coral fragments onto the bare rock faces — a move that was controversial at the time but has since produced one of the area’s most productive reef systems. A large cement cross set between the rocks at around 15–18 meters serves as the site’s centrepiece; sources confirm the cross was placed there by former Philippine President Fidel V. Ramos. Claims that the cross was specifically blessed by Pope John Paul II appear in some local accounts but are not confirmed by independent sources.
The reef structure extends from shallow sections near the rock tops down to approximately 30 meters at the deepest sections, offering varied depth zones. Most productive diving is in the 5–19 meter range.
Site Information
- Location: Bagalangit, Mabini, Batangas, Philippines
- Entry Type: Boat dive
- Site Type: Reef
- Difficulty Level: Beginner
- Maximum Depth: 19 meters
- Typical Visibility: 10–20 meters
- Current: Generally mild
- Best Time: November to June (dry season)
Marine Life
Cathedral Rock is celebrated for its nudibranch diversity, with multiple sources confirming an outstanding variety of nudibranch species across the transplanted coral surfaces. Anthias, moray eels, clownfish in anemones, and schools of surgeonfish and damselfish inhabit the reef structure. Frogfish are found tucked into sponge-covered outcrops. The cross itself has become colonized by corals and invertebrates over the years. Turtles and occasional larger reef fish are reported at the site. Note: the claim that Cathedral Rock hosts “roughly a quarter of all nudibranch species recorded in Anilao” appears in some sources but could not be independently verified — the site is genuinely excellent for nudibranch diversity, but this specific fraction is unconfirmed.
Sources: AnilaoDiving.com – Cathedral, Blue Ribbon Divers – Cathedral Rock, Lines of Latitudes – The Cathedral. Last updated 2026-06-25.
Sea-surface temperature and wave height from Open-Meteo Marine (ERA5 reanalysis, monthly averages).
12594 verified species observations (376 species) logged within ~11 km of this site between 1908 and 2025, from the Ocean Biodiversity Information System.
- Halieutaea nigra
- Styelidae
- Parabathymyrus
- Peristedion
- Odonus niger
- Samariscus triocellatus
- Fowleria vaiulae
- Hymenocephalus torvus
- Coelorinchus argus
- Tylerius spinosissimus
- Synchiropus morrisoni
- Ascidiacea
Scientific survey records skew toward sampled taxa (molluscs, corals) and do not reflect what you are guaranteed to see on a dive.
Source: OBIS (obis.org), aggregated Darwin Core occurrence records.
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