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

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.