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 ~30.8°C

Sun
14 Jun

63

good

14km/h SW
0.3m

Mon
15 Jun

53

marginal

19km/h SW
0.3m

Tue
16 Jun

53

marginal

18km/h SW
0.4m

Wed
17 Jun

55

marginal

17km/h SW
0.4m

Thu
18 Jun

56

marginal

20km/h SW
0.3m

Fri
19 Jun

58

marginal

17km/h SW
0.4m

Sat
20 Jun

58

marginal

19km/h SW
0.4m

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.