Dive site · access from Koh Tao
Sail Rock (Hin Bai)
A granite pinnacle rising ~15m above the surface and dropping to ~40m, roughly midway between Koh Tao and Koh Phangan.
- Depth
- 5–30m
- Current
- Moderate
- Minimum level
- Open water
- Access
- Boat
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The case for it
Why dive here
- Vertical chimney swim-through, enter ~18m and exit ~6m
- Schooling chevron barracuda, trevally and mackerel
- Best single whale-shark chance in the Gulf
Check before booking
What may rule it out
- Moderate current can affect whether the site is suitable on the day.
Access and timing
Plan this through Koh Tao
Best overall months: Apr, May, Jun, Jul, Aug, Sep. Check the destination planner for operating season, wildlife and other matching sites.
Wildlife
Seen around Koh Tao
rareoccasionalcommonly seenpeak seasondestination closed
These are destination-level records, not confirmed sightings at Sail Rock (Hin Bai).
Whale shark
| Month | Likelihood |
|---|---|
| January | rare |
| February | rare |
| March | occasional |
| April | occasional |
| May | occasional |
| June | rare |
| July | rare |
| August | rare |
| September | occasional |
| October | occasional |
| November | rare |
| December | rare |
Bigeye trevally
| 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 |
Hawksbill turtle
| 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 |
Bluespotted ribbontail 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 |
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 |
Nearby alternatives
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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
- Sail Rock Dive Site Koh Tao, Black Turtle Dive
Note on the data: Coordinates are approximate; not surveyed dive-site GPS.