Koh Ngai (locally known as “Koh Hai”) is a hidden gem of the Andaman Sea, gracefully positioned along the maritime boundary between Krabi and Trang provinces. Although administratively part of Koh Lanta District in Krabi, the island is geographically closer to Trang and is more commonly accessed from its coastline. Measuring approximately 4 kilometers in length and 2 kilometers in width_, Koh Ngai features a distinctive triangular shape, with much of its terrain covered by steep mountains and dense tropical rainforest. One of the island’s most defining characteristics is the complete absence of roads and motorized transport, creating a serene environment where the only sounds are the gentle waves and the calls of wildlife—perfect for travelers seeking a peaceful retreat from urban life.

The main beach stretches along the eastern coast, boasting powdery white sand and crystal-clear turquoise waters with excellent underwater visibility. A standout feature is the “house reef,” which runs parallel to the shoreline, allowing visitors to snorkel from the beach. Just a short swim offshore reveals a vibrant marine ecosystem, home to clownfish, parrotfish, and healthy coral formations in many areas. Another unique highlight of Koh Ngai is the presence of "Hornbills," often seen flying or resting among the tall trees near beachfront resorts. These birds are considered an important indicator of the island’s rich and well-preserved ecosystem.

At the southern end of the island lies “Paradise Beach,” a secluded cove offering greater privacy and a more untouched natural setting. Adventurous visitors can follow jungle trails leading to elevated viewpoints, where sweeping panoramas of nearby islands—such as Koh Ma, Koh Chueak, and Koh Waen—can be enjoyed. These surrounding islands are also known for their excellent diving spots. On clear, moonless nights, Koh Ngai transforms into an exceptional stargazing destination, thanks to its minimal light pollution, allowing the Milky Way to be seen vividly with the naked eye. Tourism on the island is carefully managed under the supervision of Mu Ko Lanta National Park, ensuring a sustainable balance between preservation and visitor experience.

• From Trang (Recommended): Depart from Pak Meng Pier via speedboat or longtail boat (approx. 45–60 minutes). There is also a larger tour boat daily during the high season.

• From Krabi: Speedboats are available from Klong Jilad Pier. Alternatively, travel from Koh Lanta by speedboat (approx. 30–45 minutes).

• Island Hopping: During the high season (November–May), ferry and speedboat services connect Koh Ngai with Phuket, Koh Phi Phi, and Koh Lanta.

• Pack mosquito repellent and itch relief cream as mosquitoes and sandflies are active at dusk.

• Wear water shoes to protect your feet from sharp coral and rocks while snorkeling near the shore.

• Use reef-safe sunscreen to protect the delicate marine ecosystem and coral reefs.

• Book your speedboat transfers in advance especially during peak season to ensure availability.

• Carry a power bank as some smaller resorts may limit electricity usage during daylight hours.

Admission Fees:

• Thai Nationals: Adults 40 THB / Children 20 THB

• Foreign Nationals: Adults 400 THB / Children 200 THB

• Note: The entry ticket is valid for 5 days for those staying overnight on the island. Please keep your ticket with you at all times for inspection during boat trips or snorkeling within the park's boundaries.

Opening Hours:

• High Season: Open for visitors from October 15th to May 15th annually (Accessible 24/7 for overnight guests).

• Monsoon Season: From May 16th to October 14th, the National Park may announce temporary closures of certain snorkeling sites or restrict travel based on weather conditions for safety.

• Travel Timing: It is highly recommended to reach the island before 4:30 PM, as public ferries and long-tail boat transfers typically cease operations in the evening for maritime safety.