Koh Ngam Yai

เกาะง่ามใหญ่

Chumphon's Crown Jewel

Beginner Peak Season

The premier snorkeling and diving destination off Chumphon, with stunning visibility and healthy reefs largely untouched by mass tourism.

Depth Range

5–16m

Site Type

island reef

Chumphon

Visibility

10–30m

27–30°C

Getting There

1 hr boat from Chumphon

~15 km offshore Chumphon

Live 7-Day Conditions — Koh Ngam Yai

SST ~30.4°C

Sun
14 Jun

67

good

13km/h W
0.2m

Mon
15 Jun

66

good

13km/h SW
0.3m

Tue
16 Jun

66

good

13km/h SW
0.3m

Wed
17 Jun

58

marginal

16km/h W
0.3m

Thu
18 Jun

68

good

11km/h SW
0.3m

Fri
19 Jun

70

good

13km/h SW
0.3m

Sat
20 Jun

69

good

14km/h W
0.3m

Marine Life

Sea Turtles Barracuda Groupers Reef Fish Whale Sharks (rare)

Notable Features

• Pristine reefs
• Minimal tourist traffic
• Excellent visibility
• Occasional whale sharks

Best Time to Visit

Jan

Feb

Mar

Apr

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec

Peak Good Now

About Koh Ngam Yai

Koh Ngam Yai is Chumphon province's flagship dive destination — a rocky island with excellent reef systems on all sides. The reefs are notably healthier than many Koh Tao equivalents thanks to far less diver traffic. Visibility is often outstanding, and the island attracts turtles, barracuda schools, and occasional whale shark sightings during plankton blooms.