Koh Muk
เกาะมุก · Trang Province
Population
2K
Budget / Month
$411
Internet
15 Mbps
Best Season
November to April (dry season, calm seas for cave access)
About Koh Muk
Koh Muk is a small island off the coast of Trang province best known for the Emerald Cave (Tham Morakot), one of Thailand's most extraordinary natural wonders. To reach it, you swim through a 70-meter pitch-black sea cave tunnel that opens into a hidden beach completely enclosed by towering limestone cliffs, open to the sky. The turquoise water inside the chamber gives the cave its name.
Beyond the cave, Koh Muk is a quiet, predominantly Muslim fishing island with about 1,500 residents. The western side has Sivalai Beach, a narrow strip of sand extending into the sea. The rest of the island is a working fishing village with rubber plantations inland. Development is modest — a handful of resorts on the west coast, simple guesthouses in the village, and not much else.
Koh Muk offers a middle ground between the development of Koh Lanta and the isolation of Koh Bulon. It has enough facilities to be comfortable but remains genuinely local and uncrowded.
Historical Note
Koh Muk has been home to a Muslim fishing community for generations. The Emerald Cave was known to locals long before tourism discovered it. The island remains primarily a fishing community with modest tourism development.
Best time to visit: November to April (dry season, calm seas for cave access)
At a Glance
Thai Name
เกาะมุก
Province
Trang
Region
Southern
Population
1,500
Area
6 km²
Elevation
160 m
Postal Code
92150
Airport
TST
Local Language
Thai, Malay
Cost of Living
budget
/month14,800 THB
~$411 USD
comfortable
/month35,200 THB
~$978 USD
luxury
/month69,500 THB
~$1,931 USD
food
| Item | Low (THB) | High (THB) |
|---|---|---|
| Local restaurant meal | 60 | 120 |
| Resort restaurant meal | 150 | 350 |
| Seafood dinner | 200 | 450 |
| Coffee (local) | 30 | 50 |
| Beer (bottle) | 70 | 110 |
| Water bottle (1.5L) | 15 | 25 |
| Cocktail | 120 | 200 |
accommodation
| Item | Low (THB) | High (THB) |
|---|---|---|
| Village guesthouse | 400 | 700 |
| Beach bungalow (fan) | 600 | 1,200 |
| Sivalai Resort | 3,000 | 8,000 |
transport
| Item | Low (THB) | High (THB) |
|---|---|---|
| Motorbike rental (day) | 250 | 350 |
| Speedboat to Koh Lanta | 400 | 600 |
entertainment
| Item | Low (THB) | High (THB) |
|---|---|---|
| Emerald Cave longtail trip | 300 | 500 |
| Four island day trip | 800 | 1,200 |
| Massage (1 hour) | 250 | 400 |
Internet & Connectivity
Speed Test Averages
vs Bangkok Average (200 Mbps)
8% of Bangkok speed
Providers
Coworking Spaces
0
Weather & Climate
November to April for dry season and calm seas essential for cave access. Go at low tide for the easiest cave swim. Early morning or late afternoon avoids tour boat crowds.
| Month | High °C | Low °C | Rain (mm) | Humidity |
|---|---|---|---|---|
| Jan | 32 | 23 | 30 | 72% |
| Feb | 33 | 24 | 15 | 70% |
| Mar | 34 | 24 | 40 | 72% |
| Apr | 34 | 25 | 120 | 76% |
| May | 33 | 25 | 300 | 84% |
| Jun | 32 | 25 | 270 | 82% |
| Jul | 31 | 25 | 280 | 82% |
| Aug | 31 | 25 | 270 | 82% |
| Sep | 31 | 24 | 330 | 85% |
| Oct | 31 | 24 | 320 | 85% |
| Nov | 31 | 24 | 180 | 78% |
| Dec | 31 | 23 | 60 | 74% |
Things to Do
Emerald Cave (Tham Morakot)
ถ้ำมรกต
Swim through a 70-meter pitch-black sea cave tunnel to emerge in a hidden beach enclosed by towering limestone cliffs, open to the sky.
Sivalai Beach (Haad Farang)
หาดสิวลัย
A narrow sandbar extending into the sea on the western tip with 270-degree sunset views and excellent swimming.
Charlie Beach
The main western beach with bungalows and restaurants. Good swimming and snorkeling along the southern end.
Island Village Walk
Explore the Muslim fishing village on the east coast with its mosque, local shops, and friendly residents going about daily life.
Four Island Day Trip
Popular tour visiting Koh Ngai, Koh Chueak, Koh Waen, and the Emerald Cave in one day with snorkeling stops.
Kayaking Along the Coast
Paddle along the limestone cliffs and explore small coves and rock formations on the island's less-visited coast.
Food & Dining
-
Fresh Seafood Curry
Fish, squid, and prawns from the local fishing fleet cooked in southern Thai curry paste with coconut milk.
100-250
Village restaurants and resort dining
โรตี
Roti with Curry
Fresh flaky roti served with rich curry dipping sauce. A Muslim-Thai breakfast staple available at village stalls.
30-50
Morning market stalls in the village
ขนมจีน
Khanom Jeen
Rice noodles with fish-based curry sauce. A southern Thai breakfast staple served in the village each morning.
30-50
Village morning market
ปลาหมึกย่าง
Grilled Squid
Freshly caught squid grilled over charcoal and served with spicy seafood dipping sauce.
80-150
Beach restaurants on Charlie Beach
Accommodation
Hostel Dorm
350 - 600
THB / night
Budget Hotel
400 - 700
THB / night
Mid-Range
1,200 - 3,000
THB / night
Luxury
3,000 - 8,000
THB / night
Studio /mo
8,000 - 15,000
THB / night
1BR /mo
10,000 - 20,000
THB / night
Best Areas for Tourists
Best Areas for Long Stay
Booking Tip
Book ahead in peak season (December-February). No ATMs on the island — bring all cash from the mainland. Many places close during monsoon.
Getting There from Bangkok
Trang Airport
Airport Code: TST
Flight to Trang + transfer + boat
1.5 hours flight + 30-40 min transfer + 30-45 min boat
3,000-5,000 THB
High-season speedboat from Koh Lanta
1-1.5 hours
400-600 THB
Getting Around
Walking
WidespreadThe island is small enough to walk across in 30-40 minutes.
Free
Motorbike rental
LimitedFor exploring farther reaches of the island.
250-350/day
Longtail boat
Tourist areas onlyWater taxi to different beaches and the Emerald Cave.
200-500
Neighborhoods
Haad Farang / Charlie Beach
Quiet tropical beachThe main tourist beach on the west coast with bungalows, restaurants, and the best swimming. Most visitors stay here.
Best for: Beach lovers and snorkelers
Village (East Coast)
Working fishing villageThe Muslim fishing village with the pier, mosque, local shops, and guesthouses. Authentic and friendly with the cheapest food on the island.
Best for: Budget travelers and culture seekers
Festivals & Events
Hari Raya
The Muslim community celebrates the end of Ramadan with family gatherings, special food, and festivities.
Loy Krathong
ลอยกระทง
Small beach celebrations with floating offerings, coinciding with the start of tourist season.
Practical Info
Hospital
No hospital or clinic; emergencies require boat evacuation to Trang mainland
Best SIM Provider
AIS
ATM Availability
Limited
Language Tip
Thai with very little English outside tourist-facing businesses. The village is Thai/Malay speaking.
Drinking Water
Tap water not drinkable. Buy bottled water.
Tipping Culture
Not expected
7-Eleven Density
Sparse
Emergency Numbers
Tourist police 1155, Emergency 191
Day Trips
Koh Ngai (Koh Hai)
Crystal-clear water and excellent snorkeling on a more upscale neighboring island.
Koh Kradan
Beautiful white-sand beach with excellent snorkeling and less development than Koh Muk.
Nearby Cities
Frequently Asked Questions
Is the Emerald Cave worth it?
Absolutely. Swimming through a dark cave tunnel to a hidden cliff-enclosed beach is one of Thailand's most unique experiences. Do not miss it.
Is the cave dangerous?
With a guide, life jacket, and calm seas, it is safe for most people. The 70-meter swim is through total darkness. Do not attempt alone or in rough conditions.
Is there an ATM?
No. Bring all cash from the mainland. Some resorts may accept cards.
How long should I stay?
Two to three nights is ideal. One day for the cave and beach, one for island hopping or relaxing.
When should I visit the cave?
Low tide is best for the easiest swim and largest interior beach. Early morning or late afternoon avoids the mid-morning tour boat crowds.
Is it suitable for families?
The cave requires swimming through darkness, which may scare young children. The beaches are calm and safe. No medical facilities on island.