Sai Daeng
ทรายแดง
Red Sand Reef
A beautiful south-coast bay named for its red-tinged sand, with healthy coral and reliable turtle sightings.
Depth Range
5–18m
Site Type
bay
Koh Tao & Offshore
Visibility
8–20m
27–30°C
Getting There
10 min boat from Koh Tao
South coast of Koh Tao
2 Jul
3 Jul
4 Jul
5 Jul
6 Jul
7 Jul
8 Jul
Marine Life
Notable Features
- • Distinctive red sand
- • Healthy coral coverage
- • Turtle encounters
Best Time to Visit
About Sai Daeng
Sai Daeng is a picturesque bay on Koh Tao's south coast, known for its reddish sand (from iron-rich granite erosion) and healthy reef system. The bay offers a nice mix of sandy patches and coral gardens, with regular turtle encounters and schools of reef fish. It's less crowded than nearby Shark Island while offering similar marine life.
Tips
Good alternative when Shark Island has too much current. Nice topside scenery too.
Experience Required
Beginner to intermediate.
Location
GPS: 10.0580°N, 99.8400°E
Learn to Freedive in the Gulf of Thailand
Sites like Sai Daeng are what the Gulf has to offer. Get certified with us on Koh Samui — train at Sail Rock and Koh Tao in groups of no more than 3, skip the Koh Tao ferry, and dive the best of the region.
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