English | German



Koh Hai (Ngai)
Koh Hai (Ngai)

The only 4 kilometre long and 2 kilometre wide Island is a very good place to relax. This island offers peace and regeneration along your stay. The underwater world is home to good sustained coral riffs and many colourful fishes and even a few see cows (dugongs) and dolphins. Excursions to the nearby islands can be organized without problems.

Koh Hai or Koh Ngai as locals call it is a nearly untouched island in front of the Trang coast. The inner part of the island is covered in dense jungle whereby the west coast which faces the mainland has many palm- lined white sandy beaches. The only with 5 square kilometres relatively small island is an ideal spot for people who are looking for a lonely place with a lot of privacy. In front of the coast there are some coral riffs which can be explored and also the surrounding marine national park offers a change in location. Due to his small size and the missing infrastructure outside of the resorts, Koh Hai is recommended just for a short stay for about 3 to 5 days.

Despite his small size the island and his neighbouring islands offers a varied program consisting of fantastic beaches and natural and almost unknown diving spots. 

koh_ngai_003.JPG koh_ngai_004.JPG koh_ngai_008.JPG koh_ngai_013.JPG koh_ngai_017.JPG koh_ngai_060.JPG
Getting there and getting around

Koh Hai can be reached from airport in the nearby city Krabi or Trang. A flight from Bangkok to Trang is the far cheaper and faster way, but there are just two flights a day, which makes it sometimes difficult to get a seat. Also in combination with the ferry which is leaving in the morning it is not easy to get to it on time after arriving at the airport. The alternative is a flight to Krabi with a transfer further to the pier in Pak Meng. The cheapest but longest trip is with the train which is operating daily from Bangkok to Trang. There will be also a transfer to the pier necessary.

From the pier in Pak Meng you will travel further with the ferry to Koh Mook and then to Koh Hai. Another opportunity is to take the speedboat from your hotel or resort. When leaving the pier, a national park fee of 200 THB will be charged. The trip with the ferry or a long-tail boat will take about 40 minutes. The speedboats from the resorts are with 15 minutes a lot faster.

Activities and Sight-seeing


The inner part of the island can be easily explored by foot. Travellers can crest after a short jungle trekking tour the highest mountain in the middle of the island for a great view over the coast and the nearby marine national park.

Koh Mook

Another possible excursion is to the nearby island Koh Mook. On this island you can visit the Emerald Cave which is called Tham Morakot by the locals. The cave can be reached through a long limestone channel that is connected to the sea. In the inside you will find an admirable lagoon surrounded by high cliffs. 

Snorkel & diving

Snorkel opportunities can be find around Koh Chueak and Koh Hai. The underwater world with tropical fishes and corals is fascinating. When divers are lucky enough, they can catch a glimpse of the rare Dugongs, a sea cow species which can only be found around this region in Thailand. For people who are interested in diving, they can contact the Rainbow Divers who are during the high season (from November to April) around the island. The two professionals from Germany are organising all sorts of trips and day tours into the region.


The beaches

On Koh Hai four snow-white beaches are inviting visitors for sunbathing. The longest beach stretches almost along the whole eastern coast. In the southeast is a small beach and in the south it has two other smaller beach sections. 

From most of the beaches guests can discover the famous biodiversity of this underwater world by snorkeling, placed directly off the coast.


As everywhere in the Andaman Sea the best time to visit the Island is from November to April. The low season starts around Mai, which means there are fewer tourists around the area. The weather is often good till the end of June with just a couple of short showers mostly in the evenings and nights. These months are a recommendation for people who want to be in a private atmosphere. 

From July until the end of October it is rainier and it can rain for a couple days in a row. During this time, there can be junk from the sea pushed in by the strong winds. When the weather conditions are too bad, the ferry service will be shut down and so we do not recommend the island as the last station before returning to the airport for the trip back home.

Tours to Koh Hai (Ngai)
Southern Thailand Island Explorer

  13 days / 12 nights

  Krabi - Koh Lanta - Koh Hai - Koh Mook

Koh Mook & Koh Hai

  8 days / 7 nights

  Koh Mook - Koh Hai

Southern Thailand Explorer: Gulf of Siam and Andaman Sea

  17 days / 16 nights

  Bangkok - Kanchanaburi - Hua Hin - Chumphon - Surat Thani - Nakhon Si Thammarat - Krabi - Koh Lanta - Koh Hai