
Koh Bida Nok
The best of Phi Phi in one rock. Wall on one side, sloping reef on the other, sharks patrolling the shallows at dawn. If you dive Phi Phi once, dive Bida Nok.
Highlights
- Dramatic limestone walls
- Blacktip reef sharks in the shallows
- Fantasy Reef soft-coral terrace
What you'll see
Photos: Donald Davesne, portioid via Wikimedia Commons · licences


Koh Bida Nok, in brief
- How deep is Koh Bida Nok?
- Koh Bida Nok ranges from 5 to 30 metres and is suited to intermediate divers. It is a wall dive with mild–moderate current.
- When is the best time to dive Koh Bida Nok?
- The season is Nov – Apr. Expect 15–30 m visibility and 28–30 °C water.
- How do you get to Koh Bida Nok?
- Day trip · 2 h from Chalong. It is in the Phi Phi area at 7.6540° N, 98.7662° E.
- What marine life can you see at Koh Bida Nok?
- Blacktip reef shark, Hawksbill turtle, Leopard shark, Barracuda. Highlights include dramatic limestone walls; blacktip reef sharks in the shallows; fantasy reef soft-coral terrace.
Gear we'd bring to Koh Bida Nok
Night diveBigblue AL1200NP Torch
Bright enough to find the cuttlefish, small enough to live in a BCD pocket all trip.
Widest viewTUSA Paragon Mask
Whale sharks at Richelieu Rock go past fast. The Paragon's field of view is the difference between seeing it and seeing its tail.
Permanently sealedSeaLife Micro 3.0
Nothing to flood. Sealed at the factory, so the only thing you think about at Anemone Reef is the clownfish.
Trips that diveKoh Bida Nok
- Day trip
Phi Phi Three-Dive Day
Three dives around the Bida islands — walls, sharks, turtles — with lunch under the cliffs of Phi Phi Leh.
- Liveaboard
Southern Liveaboard · Hin Daeng, Koh Haa, Phi Phi
The route south: manta pinnacles, the Cathedral cavern, and Phi Phi walls. Runs when the Similans are closed, too.
