Dive-site story
Rising out of the Andaman Sea south of Phi Phi Ley, the twin limestone islets of Koh Bida Nok and Koh Bida Nai form one of the premier marine habitats in the region. Underwater, dramatic vertical limestone walls drop into sloping reefs covered in soft corals and gorgonian fans, complemented by shallow hard coral gardens and swim-throughs. Divers frequently encounter schooling pelagics around the exposed points alongside reef sharks cruising along the sandy fringes.
Resident blacktip reef sharks patrolling the shallow bays and reefs
Leopard sharks resting on the outer sandy seafloor
Extensive swim-throughs and overhangs adorned with sea fans and glassfish
Dense schools of chevron barracuda and trevally circling the blue water
Location
Use the map to plan with your operator and confirm the exact entry point on the day.
Seasonality
Calmest seas and peak water clarity align with the northeast monsoon period.
Marine life
| Species | Likelihood | J | F | M | A | M | J | J | A | S | O | N | D |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Blacktip Reef SharkCarcharhinus melanopterus | Common | ||||||||||||
| Zebra SharkStegostoma tigrinum | Seasonal | ||||||||||||
| Hawksbill TurtleEretmochelys imbricata | Common | ||||||||||||
| Bigeye TrevallyCaranx sexfasciatus | Common | ||||||||||||
| Giant MorayGymnothorax javanicus | Common | ||||||||||||
| Chevron BarracudaSphyraena qenie | Common |
Marine forecast
