
Horseshoe
Cocos (Keeling) Islands · Australia
A horseshoe-shaped reef formation on the northern atoll rim creates a natural amphitheatre where currents eddy and concentrate marine life. Manta rays cruise the cleaning stations here with regularity during April through September, joined by eagle rays and the ever-present grey reef and blacktip sharks. The reef crest is extraordinarily healthy, with almost no bleaching visible in recent years, and the drop-off delivers walls of anthias and glassfish.
Conditions
Depth
5 to 28 m
Open water and up
Current
Can be moderate
Can pick up on the edge
Visibility
22 to 35 m
Clearest in the calm season
Water
26 to 30°C
3mm wetsuit
Month by month
| Month | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Water (°C) | 28 | 28 | 28 | 28 | 27 | 26 | 26 | 26 | 27 | 27 | 28 | 28 |
| Vis (m) | 18 | 18 | 20 | 22 | 22 | 22 | 22 | 22 | 22 | 20 | 19 | 18 |
| Current | Moderate | Moderate | Gentle | Gentle | Moderate | Moderate | Moderate | Moderate | Gentle | Gentle | Gentle | Moderate |
Your chances of seeing each animal
Blacktip Reef Shark
Last confirmed Jun 11, 2026 · 40 records
Almost always
Nearly every dive
Grey Reef Shark
Last confirmed Oct 14, 2025 · 8 records
Very likely
Most dives
Goldlined Anthias
Expected
Known here, not yet in recent logs
Glassfish
Expected
Known here, not yet in recent logs
Acropora Coral
Expected
Known here, not yet in recent logs
Giant Clam
Expected
Known here, not yet in recent logs
Manta Ray
Expected
Known here, not yet in recent logs
Eagle Ray
Expected
Known here, not yet in recent logs
Gear