Koh Muk is the third-largest island in the Trang Sea, featuring limestone mountains and steep cliffs, while still offering beautiful beaches and clear seawater. The island has a strong local community, with the Koh Muk Village, a native fishing community, promoting eco-friendly tourism.

The most significant highlight is the EmeraldCave (Tham Morakot), known as a gateway to another world. Visiting the cave requires swimming through an 80-meter dark and winding tunnel, accessible only when the tide is low. Upon exiting the tunnel, visitors will find a large chamber with an open skylight above. The beach inside is powdery white, surrounded by towering limestone cliffs. When sunlight enters the chamber, it creates a stunning emerald-green glow, true to the cave’s name.

Besides the Emerald Cave, Koh Muk also features notable beaches such as FarangBeach (Charlie Beach), known for its beauty, accommodations, and beachfront restaurants. Other attractions include Hua Laem Bay and Pangka Bay, home to seagrass fields and shallow coral reefs ideal for snorkeling.

• Ferry Boat: From Kuan Tung Ku Pier (Kantang District), the most convenient departure point.

• Ferry Boat: Approximately 30 minutes.

• Long-tail Boat: Available for private charter with faster travel time.

• From Pak Meng Beach: Visitors can purchase the 4-Island Tour package (including Emerald Cave and Koh Muk), traveling by speedboat or large tour boat from Pak Meng Pier.

• Swimming is the only way to access the cave, and it must be done during low tide (usually 10:00–14:00, depending on the daily tide chart). It is recommended to visit with an expert or tour operator.

• Best travel period: November–May, when the sea is calm and weather is pleasant.

• Staying overnight on Koh Muk is recommended to enjoy the evening atmosphere at Farang Beach and explore the local community lifestyle.

Admission Fees:

Since Koh Muk is part of Hat Chao Mai National Park, visitors must pay the park entrance fee.

• Thai Citizens: Adults 40 THB, Children 20 THB

• Foreigners: Adults 200 THB, Children 100 THB

Opening Hours:

• The island is accessible year-round, but access to the EmeraldCave depends on daily tide conditions.