Bida Nok
Koh Phi Phi · Thailand
The larger of the two uninhabited Bida islets south of Phi Phi Le. A near-vertical wall on the west side drops from 3 m to beyond 30 m, encrusted with sea fans, barrel sponges, and black coral. Leopard sharks park on the sandy ledges at 18 to 22 m throughout the year. Strong upwellings on the southwest corner attract bumphead parrotfish and occasional whale sharks during the March to April window.
Conditions
Depth
3 to 35 m
Advanced depths
Current
Often strong
Can pick up on the edge
Visibility
5 to 12 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) | 27 | 27 | 28 | 28 | 28 | 28 | 27 | 27 | 27 | 27 | 27 | 26 |
| Vis (m) | 18 | 20 | 20 | 15 | 8 | 5 | 5 | 5 | 5 | 8 | 15 | 18 |
| Current | Moderate | Gentle | Moderate | Moderate | Strong | Strong | Strong | Strong | Strong | Moderate | Gentle | Gentle |
Your chances of seeing each animal
Barrel Sponge
Last confirmed Jun 19, 2025 · 13 records
Very likely
Most dives
Bluefin Trevally
Last confirmed Mar 21, 2025 · 2 records
Likely
About 6 in 10 dives
Leopard Shark
Expected
Known here, not yet in recent logs
Black Coral
Expected
Known here, not yet in recent logs
Sea Fan
Expected
Known here, not yet in recent logs
Yellowtail Snapper
Expected
Known here, not yet in recent logs
Giant Clam
Expected
Known here, not yet in recent logs
Bumphead Parrotfish
Expected
Known here, not yet in recent logs
Gear