Blue Holes
Blue Corner · Palau
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 window, then drift to Blue Corner. Beam-shafts of light through the openings make it one of the most photographed dives in the Pacific.
Conditions
Depth
10 to 35 m
Advanced depths
Current
Can be moderate
Can pick up on the edge
Visibility
15 to 25 m
Clearest in the calm season
Water
28 to 30°C
Tropical wetsuit
Month by month
| Month | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Water (°C) | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 |
| Vis (m) | 25 | 25 | 25 | 25 | 25 | 20 | 15 | 15 | 15 | 20 | 25 | 25 |
| Current | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate |
Your chances of seeing each animal
Grey reef shark
Last confirmed May 15, 2026 · 130 records
Almost always
Nearly every dive
Whitetip Reef Shark
Last confirmed May 30, 2026 · 59 records
Almost always
Nearly every dive
Napoleon Wrasse
Last confirmed Jun 8, 2026 · 36 records
Very likely
Most dives
Bignose Unicornfish
Last confirmed Jun 27, 2026 · 32 records
Very likely
Most dives
Harlequin Sweetlips
Last confirmed Jun 12, 2026 · 20 records
Very likely
Most dives
Hawksbill Sea Turtle
Last confirmed Apr 8, 2026 · 31 records
Very likely
Most dives
Shadowfin Soldierfish
Last confirmed Apr 7, 2026 · 26 records
Very likely
Most dives
Schooling bigeye trevally
Last confirmed Mar 2, 2026 · 14 records
Likely
About 6 in 10 dives
Gear