Koh Samui is a popular name in Thailand’s tourism industry as one of the most coveted holiday destinations in the country. Millions of tourists come to Koh Samui annually to unwind and explore the many dive spots that await diving enthusiasts. There are plenty of dive centers that operate on the island to facilitate one of the most sought after activities in this tropical wonderland.


Koh Samui is one of 600 islands that make up the Chumphon Archipelago. Also included within that archipelago are many other popular destinations in Thailand such as Koh Tao, Koh Phangan, and Ang Thong Marine Park. It is also the third largest island in Thailand.

There are a host of underwater activities that await those who are adventurous enough to take the plunge in Koh Samui. You will be rewarded with fantastic views of the beauty that is lurking underwater – rich coral reef environment and well-preserved marine life. The temperature of the water is also ideal for diving with a range of 28-29 degree Celsius.

For those interested to go diving in Koh Samui, please be informed that some of the dive spots are closed from May to October. This is part of Thailand’s efforts to preserve and protect its deep-sea ecosystem. Take note of this information when planning your next diving trip to Koh Samui.

The exquisite beauty and charm of Koh Samui is what continues to draw tourists to this gorgeous island. Aside from the gorgeous dive spots, you can also indulge in the sandy beach shores, fresh seafood, and crystal-blue waters. This is why Koh Samui is visited by millions yearly – there is something for everyone here.


moray in Koh Samui

Sali Rock
Many diving experts are of the opinion that Sali Rock is the best dive site in the Gulf of Thailand. It is a 30-meter tall granite pinnacle located between Koh Phangan and Koh Samui. Since there are no other rock formations in the area, this serves as the congregation point for fishes. If you are lucky, you could even spot whale sharks in the area.

The Chimney
When diving on a sunny day, you can marvel at the view of the spectacular boulders. But one of the main highlights for the divers that come to this spot in Koh Samui is ‘The Chimney’. To get here, you must enter through a hole in a rock that measures 20 meters. From there, you will exit into another hole that is about 10-15 meters in width to find more marine species like boxer shrimps, glassfish, and moray eels, to name a few.

South-West Pinnacle
The South-West Pinnacle in Koh Samui is a dive site known for its rock formations. But that is not all that this dive spot is known for – the rich marine life is another. The rock formations are sought after by divers because they serve as home for snappers, harlequin sweetlips, and sweetlips swoose. You can also feast your eyes on the vibrant colors of anemones in all shades of blue, green, and pink.

Koh Yippon
This is another one of Koh Samui’s popular dive spots. It is located north of the Angthong Marine Park that offers diving spots of up to 18 meters deep. Even though this is a shallow dive site, there are plenty of anemones, soft corals, and barrel sponges that are visible from the surface of the water. If you dare to go deeper, you can spot schools of fusiliers, barracudas, and blue-spotted sting rays.

Chumphon Pinnacle
When heading for a dive trip to Koh Samui, make sure to add Chumphon Pinnacle to your itinerary. This dive spot is among the list of stops for many diving day trips on the island. This spot is located a few hours from Koh Samui and is popular because of its gorgeous coral reef environment. You can also find impressive granites on the site. If that is not enough, among other sightings on the area are manta rays, batfishes, and groupers.

Koh Wao (Dragon Island)
This dive spot in Koh Samui is called Dragon Island because the shape resembles a sleeping dragon. This island consists of a shallow bay that is teeming in marine life and submerged boulders. This is a great dive spot for beginners because the water is usually calm with mild or absent currents. You can also find a wide array of anemones and hard coral species underwater. If you dare to explore the sandy floor of the boulders around 20 meters deep, you can also spot sting rays.

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Since Thailand is in the tropics, it is warm all year round. The warmer and wetter monsoon season is during May to September, and is more dry around November to mid-March.

Different regions have different climates, but the Gulf of Thailand is at its peak from May through September.


By Air:
The closest airport to Koh Samui is the Samui International Airport. There are daily flights to Koh Samui from Bangkok, Pattaya, or Phuket via Thai Airways or Bangkok Airways.

By Land:
There are several options to travel to Koh Samui by land. One of them is via night train from Bangkok. When you reach Surat Thani, you must transfer to the ferry port bound for Koh Samui. If you are planning to take the night train, it is best to book ahead.

Another mode of land transportation to Koh Samui is via bus. You can choose from different bus classes on offer as they vary largely in terms of the travel experience, cost, and comfort. The journey from Bangkok to Surat Thani is about 10 hours.


koh lanta diving
Koh Samui has more to offer its visitors aside from diving. While it is the most popular activity in Koh Samui, you will be spoiled for options to create your idea of a perfect beach holiday.

There are several lovely quaint, white sand beaches and quiet coves to explore in Koh Samui. Snorkeling is another great water activity that you can enjoy, especially with the clear blue waters.

There are also other attractions for those seeking a more laid-back holiday. Koh Samui is teeming with options when it comes to luxury spas, swanky villas, world-class dining, and vibrant nightlife.




Koh Samui is an island that measures 21 km long and 25 km wide. It is located off Kra Isthmus’ east coast and is part of the Surat Thani province. Koh Samui is located south of other famous resort islands like Ko Tao and Ko Phangan.

The island of Koh Samui is notable for its palm-fringed beaches and dive sites. But the central part of the island is a tropical jungle. In fact, it is home to the largest mountain on the island – Khao Pom. The climate in Koh Samui is that of a tropical savanna. Expect a warm and humid climate nearly all year round.

Time zone:

Calling code:

Closest airport:

220-240 V


“Hello” in Thai:
Sawasdee (sah-wah-dee)