Koh Sam Sao

เกาะสามเส้า

Three Pillars Island

Beginner Peak Season

An island known for its natural stone arch and shallow snorkeling waters in the Ang Thong archipelago.

Depth Range

1–10m

Site Type

snorkeling

Ang Thong Marine Park

Visibility

5–15m

27–30°C

Getting There

1.5 hr from Koh Samui

~30 km NW of Koh Samui

Live 7-Day Conditions — Koh Sam Sao

SST ~31°C

Mon
18 May

37

poor

31km/h W
0.6m

Tue
19 May

39

poor

31km/h W
0.6m

Wed
20 May

40

marginal

29km/h SW
0.5m

Thu
21 May

41

marginal

30km/h SW
0.6m

Fri
22 May

41

marginal

28km/h SW
0.5m

Sat
23 May

51

marginal

25km/h SW
0.5m

Sun
24 May

40

marginal

28km/h SW
0.5m

Marine Life

Reef Fish Starfish Sea Cucumbers

Notable Features

• Natural stone arch
• Iconic photo spot
• Shallow snorkeling

Best Time to Visit

Jan

Feb

Mar

Apr

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec

Peak Good Now

About Koh Sam Sao

Koh Sam Sao features a famous natural stone arch that has become one of Ang Thong's most photographed landmarks. The surrounding waters offer shallow snorkeling with a sandy bottom and scattered coral patches. It's a popular photo stop and light snorkeling destination on Ang Thong day trips.