Sail Rock
หินใบ
The Crown Jewel of the Gulf
A massive granite pinnacle rising from 40m to break the surface, famous for whale shark encounters and its iconic vertical chimney swim-through.
Depth Range
5–40m
Site Type
pinnacle
Koh Tao & Offshore
Visibility
10–35m
27–30°C
Getting There
1.5 hr boat ride
~30 km from Koh Samui
18 May
19 May
20 May
21 May
22 May
23 May
24 May
Marine Life
Notable Features
- • Famous chimney swim-through (18m to 6m)
- • Barracuda tornados
- • Whale shark encounters Mar–May
- • Massive batfish schools
Best Time to Visit
About Sail Rock
Sail Rock is the Gulf of Thailand's premier dive site — a towering granite monolith midway between Koh Phangan and Koh Tao. The chimney, a vertical swim-through from 18m to 6m, is one of the most thrilling experiences in Thai waters. Enormous schools of chevron barracuda spiral around the rock while giant groupers lurk in the shadows. From March to May, whale sharks cruise through the plankton-rich waters, making this a world-class big animal encounter.
Tips
Book a morning trip for calmer seas and better light in the chimney. Descend early to beat the scuba bubbles if freediving.
Experience Required
Comfortable to 20m+ for freediving. Open Water certified for scuba.
Location
GPS: 9.8800°N, 100.0600°E
Freedive Sail Rock With Us
We run trips to Sail Rock from Koh Samui. Maximum 3 students per trip. All equipment and safety gear provided.