Ko Muk and Morakot Cave is the third largest island in Trang Province, located in Kantang District. The eastern side of the island is home to a traditional fishing community with local piers and various accommodation options. The western side, in contrast, features tall limestone cliffs — the location of the famous Emerald Cave.

Emerald Cave is considered the ultimate highlight of the Trang Sea and one of Thailand’s world-renowned “Unseen Thailand” attractions. To access the cave, long-tail boats anchor in front of the cave entrance, and visitors must swim through a dark tunnel for about 80 meters. The journey through the darkness is thrilling, and once you emerge inside, you’ll find a vertical opening to the sky and a pristine white-sand beach hidden within the cave chamber.

The name “Emerald Cave” comes from the natural phenomenon created when sunlight shines into the cave, illuminating the seawater in a stunning emerald-green hue.

• Tour Boats / Private Boat Charter: Most visitors join a One Day Trip or charter a private boat from Pak Meng Pier in Sikao District — the main gateway to the Trang Islands. Travel time from the pier to Koh Mook and Emerald Cave is approximately 40 minutes to 1 hour.

• Public Passenger Boats: Travelers can also take a public boat from Kuan Tung Ku Pier in Kantang District. This option is ideal for those staying overnight on Koh Mook.

• Access to Emerald Cave depends on tide conditions. Visitors often swim while holding onto a rope for safety, especially during high tide.

• The best time to visit is during low tide, typically in the morning, when entering the cave is safest and easiest.

• Bring a waterproof bag for phones and cameras since swimming is required.

• Koh Mook is close to other popular islands, such as Koh Kradan and Koh Chueak, which are often included in the same One Day Trip package.

Entrance Fees:

There is no direct fee to enter the cave, but visitors must pay the entrance fee for Hat Chao Mai National Park (not included in tour packages)

• Thai Citizens: Adults 40 THB, Children 20 THB

• Foreigners: Adults 200 THB, Children 100 THB

Opening Hours:

• Open daily from 07:00 – 17:00 (Actual cave entry times vary according to sea level and tide conditions.)