Palau · Micronesia
Blue Corner
Peak visibility and dry-season liveaboard conditions for current dives.
Blue Corner is a reef hook dive: you clip into the wall and watch schools of jacks, barracuda, grey reefs, and the occasional eagle ray patrol the corner where the current splits. Palau itself adds Jellyfish Lake, German Channel manta cleaning stations, and a couple of WWII wrecks.
Good season
Divable year-round. November–May is drier; June–October has more rain and occasional storms.
Trip duration
7–10 nights land-based on Koror; 7-night liveaboards available.
Dive style
Reef hook drift diving with negative entries; current is the whole point.
Dive level
Advanced + reef hook comfort; some sites require 50+ dives.
Reef health
What you’ll actually findSome loss since the 2010s, but the reef still has plenty to dive. Pick depth and shoulder-season carefully.
Coral reef health
How is this calculated?On current trend, no live coral by ~2119. Losing about 0.4% cover per year — roughly 95 years of reef left to see if nothing changes.
Heat stress right now
Mild warmth. Worth watching — no bleaching yet.
NOAA Coral Reef Watch · updated May 2026 · 1.3 °C-week heat dose
What to expect on a dive
Blue Corner shark current still produces. Outer reefs buffered by oceanic upwelling. Inner lagoon reefs show more bleaching — skip the inside in favour of the channels.
Sources, methodology, and the raw numbers
Raw observed numbers
- Coral cover: 38% (survey May 2024, Palau International Coral Reef Center benthic survey)
- Bleached: 11%
- Recent mortality: 3%
- Palau's deep oceanic upwelling provides some thermal buffering for outer reefs.
Raw thermal numbers
- NOAA CRW alert level: Watch
- Degree Heating Weeks: 1.3 °C-wk
- SST anomaly: +0.5 °C
How we summarise this
Observed coral cover, bleaching, and mortality come from named in-situ surveys with a stated date and method — they describe one snapshot of one reef and do not extrapolate to neighbouring sites. Current thermal stress is satellite-derived from NOAA Coral Reef Watch at ~5 km resolution; it indicates risk, not observed coral damage. We deliberately separate observed condition, current thermal stress, and projection — and we never publish a projection without a documented model and uncertainty.
Sources
- International Coral Reef Initiative — ICRI Secretariat
- Global Coral Reef Monitoring Network — GCRMN / ICRI
- NOAA Coral Reef Watch — U.S. National Oceanic and Atmospheric Administration
- AIMS Long-Term Monitoring Program — Australian Institute of Marine Science
- Atlantic and Gulf Rapid Reef Assessment — AGRRA Program / Perry Institute for Marine Science
- NOAA National Coral Reef Monitoring Program — NOAA Coral Reef Conservation Program
- Reef Check — Reef Check Foundation
- NOAA CoastWatch / OceanWatch — NOAA NESDIS / STAR
- Allen Coral Atlas — Arizona State University Center for Global Discovery and Conservation Science
- Great Barrier Reef Marine Park Authority — Australian Government
- Reef Life Survey — Reef Life Survey Foundation
- NASA PO.DAAC — NASA Jet Propulsion Laboratory / Caltech
- Copernicus Marine Service — Mercator Ocean International for the European Union
- NASA Ocean Color (OB.DAAC) — NASA Goddard Space Flight Center / Ocean Biology Processing Group
- Argo float network — International Argo Program / UCSD
- CoralWatch — University of Queensland
- IMOS / AODN — Integrated Marine Observing System / Australian Ocean Data Network
- WRI Reefs at Risk Revisited — World Resources Institute
- Ocean Health Index — OHI partnership (Conservation International + UCSB + NCEAS)
- IPCC Special Report on the Ocean and Cryosphere (SROCC) — Intergovernmental Panel on Climate Change
- GOA-ON — Global Ocean Acidification Observing Network — GOA-ON Secretariat + IOC-UNESCO
- HAEDAT — Harmful Algae Event Database — IOC-UNESCO Intergovernmental Panel on Harmful Algal Blooms
- NCEI Marine Microplastics — NOAA National Centers for Environmental Information
Reef condition changes year to year. If you visit, consider supporting responsible-travel and conservation operators on the ground.
Pressure on this reef
Protection · fishing · what you can doProtected-area status
No-take reserveFully no-take — no fishing of any kind. The strongest protection tier.
Fishing pressure
Low fishing pressureDominant pressures
- dive tourism
- warming
3 Green Fins-verified operators known at this location.
What you can do
Palau National Marine Sanctuary protects 80% of the EEZ as no-take. The Palau Pristine Paradise Pledge is signed on arrival — read it and live it.
Protection status sourced from Protected Planet / WDPA and refined with Marine Protection Atlas. Fishing pressure proxy is Global Fishing Watch AIS data. See the methodology for what these sources can and can’t prove.
Dive sites here
3 curated
German Channel
Cut-through channel dredged in 1908 connecting inner lagoon to outer reef. Mantas come in to be cleaned on the sandy bottom, and grey reef s…
Blue Holes
Four vertical shafts in the reef table that open into a single cavern. Drop through the holes at 10 m, exit at 30+ m through the cavern wind…
Big Drop-Off
A near-vertical wall running the southwestern flank of Ngemelis Island, dropping from a 3 m reef crest into 270 m of blue. Jacques Cousteau …
Gear
What to bringSite-specific add-ons
Some dive sites here call for extra gear. Check the individual site page for full context.
- Surface marker buoy — Drift exits in the channel — operators require SMB. · German Channel
- Dive light — Cavern is dark below 20 m — even with surface light overhead. · Blue Holes
- SMB + reel — Standard exit is a drift along the wall into open water; surface marker is required for boat pickup. · Big Drop-Off
What divers say
“Hooked in at Blue Corner with sharks crossing every 20 seconds — there's a reason it's on every dive bucket list.”