Sai Daeng
ทรายแดง
Red Sand Reef
Intermediate
Peak Season
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
Live 7-Day Conditions — Sai Daeng
SST ~30.2°C
Mon
18 May
18 May
26
Tue
19 May
19 May
39
Wed
20 May
20 May
42
Thu
21 May
21 May
42
Fri
22 May
22 May
42
Sat
23 May
23 May
41
Sun
24 May
24 May
41
Marine Life
Sea Turtles
Barracuda
Anemonefish
Angelfish
Notable Features
- • Distinctive red sand
- • Healthy coral coverage
- • Turtle encounters
Best Time to Visit
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
Peak
Good
Now
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