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Hotels, dive operators, gear, and how to get here are on the Blue Corner location page.
Overview
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 called it the best wall dive in the world. Plankton-rich currents feed a dense garden of sea fans, soft corals, and barrel sponges that line the upper face, while pyramid butterflyfish swarm above. Grey reef, white-tip, and resting leopard sharks patrol along the wall; hawksbills graze sponges; leaf fish and lionfish hide in coral cracks. Usually run as a single-tank drift; conditions stay benign enough that the entry can be 3 m deep at low tide.
Briefing note
Requires a Rock Islands / Southern Lagoon permit (purchased in Koror, currently $50 valid 10 days) plus a separate Koror state diving permit. Current can run unexpectedly along the wall — watch your depth, the bottom is 270 m below you.
What you'll see
7 species curated- year-roundGrey reef shark
- year-roundWhitetip reef shark
- year-roundLeopard shark
- year-roundHawksbill turtle
- year-roundPyramid butterflyfish
- year-roundSoft corals and sea fans
- year-roundLeaf scorpionfish
Sightings evidence
1 record on file- high confidenceGrey reef shark
- Last confirmed
- Apr 2026
- Recent records
- 130 within 10 km
Sources & methodology
How we summarise this
We aggregate confirmed occurrence records from GBIF and OBIS within a fixed radius of each dive site. Occurrence records confirm presence and reveal seasonality clustering, but they DO NOT measure per-dive probability — there is no eligible-effort denominator. We deliberately do not publish a numeric '% chance of sighting' from this data.
Sources
- Global Biodiversity Information Facility — GBIF Secretariat
- Ocean Biodiversity Information System — IOC-UNESCO
- iNaturalist — California Academy of Sciences & National Geographic Society
- IUCN Red List of Threatened Species — International Union for Conservation of Nature
- Wildbook (Sharkbook, Whale Shark, Manta Matcher) — Wild Me
- OBIS-SEAMAP — Duke University Marine Geospatial Ecology Lab / OBIS
- WoRMS — World Register of Marine Species — Flanders Marine Institute (VLIZ)
- FishBase — FishBase Consortium
- Atlas of Living Australia — CSIRO / GBIF Australia
- REEF Volunteer Fish Survey — Reef Environmental Education Foundation
Conditions
| Month | Water | Visibility | Current |
|---|---|---|---|
| Jan | 27–29 °C | 25–40 m | moderate |
| Feb | 27–29 °C | 25–40 m | moderate |
| Mar | 28–29 °C | 25–40 m | moderate |
| Apr | 28–30 °C | 25–40 m | moderate |
| May | 28–30 °C | 20–35 m | moderate |
| Jun | 28–30 °C | 15–30 m | moderate |
| Jul | 28–30 °C | 15–25 m | moderate |
| Aug | 28–30 °C | 15–25 m | moderate |
| Sep | 28–30 °C | 15–25 m | moderate |
| Oct | 28–30 °C | 20–30 m | moderate |
| Nov | 28–29 °C | 25–40 m | moderate |
| Dec | 27–29 °C | 25–40 m | moderate |
Season calendar
Peak season highlighted · current month outlined
Gear for this site
Beyond the basic kit- SMB + reel — Standard exit is a drift along the wall into open water; surface marker is required for boat pickup.
Next step
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