Dive site · access from Phi Phi & Koh Lanta
Koh Bida Nai
The sister islet to Bida Nok, with resting Indo-Pacific leopard sharks on sandy patches, seahorses and ghost pipefish in the corals, and easy topography suiting Open Water divers.
- Depth
- 5–22m
- Current
- Mild
- Minimum level
- Open water
- Access
- Boat
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The case for it
Why dive here
- Leopard (zebra) sharks on the sand
- Swim-throughs and hard-coral gardens
Check before booking
What may rule it out
- Conditions can change. Confirm depth, current and access with a local operator.
Access and timing
Plan this through Phi Phi & Koh Lanta
Best overall months: Nov, Dec, Jan, Feb, Mar, Apr. Check the destination planner for operating season, wildlife and other matching sites.
Wildlife
Seen around Phi Phi & Koh Lanta
rareoccasionalcommonly seenpeak seasondestination closed
These are destination-level records, not confirmed sightings at Koh Bida Nai.
Hawksbill turtle
| Month | Likelihood |
|---|---|
| January | commonly seen |
| February | commonly seen |
| March | commonly seen |
| April | commonly seen |
| May | commonly seen |
| June | commonly seen |
| July | commonly seen |
| August | commonly seen |
| September | commonly seen |
| October | commonly seen |
| November | commonly seen |
| December | commonly seen |
Bluespotted ribbontail ray
| Month | Likelihood |
|---|---|
| January | commonly seen |
| February | commonly seen |
| March | commonly seen |
| April | commonly seen |
| May | commonly seen |
| June | commonly seen |
| July | commonly seen |
| August | commonly seen |
| September | commonly seen |
| October | commonly seen |
| November | commonly seen |
| December | commonly seen |
Great barracuda
| Month | Likelihood |
|---|---|
| January | occasional |
| February | occasional |
| March | occasional |
| April | occasional |
| May | occasional |
| June | occasional |
| July | occasional |
| August | occasional |
| September | occasional |
| October | occasional |
| November | occasional |
| December | occasional |
Indo-Pacific Leopard Shark (Zebra Shark)
| Month | Likelihood |
|---|---|
| January | commonly seen |
| February | commonly seen |
| March | commonly seen |
| April | commonly seen |
| May | commonly seen |
| June | commonly seen |
| July | commonly seen |
| August | commonly seen |
| September | commonly seen |
| October | commonly seen |
| November | commonly seen |
| December | commonly seen |
Spotted eagle ray
| Month | Likelihood |
|---|---|
| January | occasional |
| February | occasional |
| March | occasional |
| April | occasional |
| May | occasional |
| June | occasional |
| July | occasional |
| August | occasional |
| September | occasional |
| October | occasional |
| November | occasional |
| December | occasional |
Nearby alternatives
Compare another site
Sources & last checked
Checked July 2026
Research is source-backed, but conditions and fees should still be confirmed locally.
View 1 source and checking notes
- Bida islands: Bida Nok, Nai & Hin Bida, Andaman Dive Adventure Lanta
Note on the data: Coordinates are approximate; not surveyed dive-site GPS.