Koh Mook & Emerald Cave | Trang

Koh Mook is an island located in the Trang Province of Thailand. It is known for the Emerald Cave, a sea cave accessible by swimming.

Visual Characteristics

Koh Mook features limestone cliffs and dense tropical vegetation. The Emerald Cave is a dark, narrow passage that opens into a circular lagoon. The water within the lagoon is clear and exhibits a green hue due to light refraction. The cave walls are damp limestone, and the lagoon floor is sandy.

Location & Access Logistics

Koh Mook is situated approximately 800 kilometers south of Bangkok. Access is primarily via ferry or longtail boat from the mainland pier at Kuan Tung Ku. The journey from Kuan Tung Ku to Koh Mook takes approximately 45 minutes to 1 hour. There is no direct road access from the mainland. Parking is available at Kuan Tung Ku pier. Local transport on the island consists of motorbike taxis and bicycles.

Historical & Ecological Origin

The limestone formations of Koh Mook are part of the Andaman Sea's karst topography, a geological process involving the dissolution of soluble rocks like limestone by water over millions of years. The island's ecological classification is tropical rainforest island. The Emerald Cave's formation is a result of coastal erosion and sea-level changes.

Key Highlights & Activities

Swimming through the Emerald Cave is the primary activity. Visitors can also explore the island's beaches, such as Charlie Beach (Hat Farang). Snorkeling is possible in designated areas around the island. Kayaking tours are available, offering access to smaller coves.

Infrastructure & Amenities

Basic amenities are available on Koh Mook, including small resorts and restaurants. Restrooms are located at popular beach areas and near accommodation. Shade is provided by natural tree cover and some man-made structures. Cell phone signal (4G) is generally available in populated areas. Food vendors and small shops are present near the main pier and beaches.

Best Time to Visit

The best time to visit Koh Mook for favorable weather is during the dry season, from November to April. The sea is typically calmer during these months. For the Emerald Cave, visiting during daylight hours is essential for visibility. High tide can make access more challenging due to water levels within the cave passage.

Facts & Legends

The Emerald Cave is also known locally as Tham Morakot. It was historically used by local fishermen as a shelter during storms. A specific tip for visitors is to carry a waterproof bag for electronics and valuables when entering the cave, as water levels can fluctuate.

Nearby Landmarks

• Koh Kradan (2km Southeast)
• Koh Ngai (4km Southwest)
• Koh Libong (15km West)
• Trang City (40km North)