Diving in Samui is a hugely popular activity thanks to the crystal-clear, warm waters surrounding the island. Last-minute bookings for dive excursions or courses are easily arranged, and it has become a major draw for travelers. Given this popularity, numerous dive clubs offer highly competitive prices for courses aimed at beginners. Beyond the appeal of affordability, you can often choose an English-speaking instructor.

One reason diving courses are so popular here is that you can dive directly from the beach in calm, shallow waters. Samui offers many sheltered coves where you can discover magnificent underwater landscapes covered in coral.

Underwater visibility around the island ranges from 2 to 15 meters, and currents, though variable, are never particularly strong.

Most dive clubs operating in Samui are easy to find, located in the main tourist centers. For beginners or those on a short stay, the surrounding local reefs offer lovely sites, accessible by boat in 5 to 25 minutes: Lamai Reef, Chaweng Reef, Koh Matlang and Waikiki Reef.

For enthusiastic and more experienced divers, the following sites (to name just a few) are about 2 hours by boat: Ang Thong National Park, Koh Tao, Sail Rock, Red Rock and Kho Nang Yuan.

The Best Dive Sites from Koh Tao

About 70 km north of Samui lies the island of Tao (Koh Tao, in Thai: the turtle island). The island and its surroundings offer numerous dive sites. It is also a tropical paradise with white sand beaches ideal for jungle excursions. Here, underwater visibility ranges from 15 to 30 meters, and among the most popular sites are: the Pinnacles of Chumphon with the granite formations of Nang Yuan to the southwest, Green Rock, White Rock and Red Rock. The waters surrounding the island are home to abundant marine life including barracudas, tuna, snappers and sea turtles.

The Chumphon Pinnacles

Considered one of the region's most challenging sites. With occasionally strong currents and depths ranging from 10 to 35 m, the site consists of underwater pinnacles, the highest reaching about 16 m below the surface. During your dive, you can swim alongside large Groupers and other big pelagic fish, including schools of Barracudas, Tuna and Mackerel.

Southwest Pinnacles

This site comprises a series of 3 rock formations at depths ranging from 4 to 30 m – representing a series of underwater "walls." The tops of the rocks are covered with plants offering a wide array of colors. Between the rocks you'll find black coral "whip corals" and Gorgonians "sea fans." Leopard Sharks are often visible, and occasionally Whale Sharks can be spotted. Giant Groupers are common here as well as Barracudas and Snappers.

Samran Pinnacles

This site is better reserved for experienced divers due to its greater depth and stronger currents. The rocks rise to 12 m below the surface and attract large schools of Jackfish (many varieties), Trevally, and giant Barracudas.

Green Rock

This site is interesting for its scope, with depths ranging from 4 to 25 m. Numerous rock arches, caverns, caves and underwater crevices make it an exciting place to explore. On the site, many Harlequin Fish, Sweetlips, Blue Ringed Angelfish and Moray Eels. You can sometimes spot White-Tip Reef Sharks and, venturing deeper, large Groupers, schools of Yellow Tail, Fusiliers and Silver Pomano.

White Rock

This dive allows you to explore 2 underwater pinnacles whose summits lie just 2 m below the surface but descend to 18 – 22 m. Schools of Butterfly Fish and Angelfish dominate, and colonies of Staghorn corals attract Breams and Damsels to settle here. On each dive you can see Sea Snakes, turtles, Moray Eels and Blue-Spotted Rays. As dangerous as it is thrilling is an encounter with the Titan Triggerfish – it's their territory and they remain quite unpredictable in their behavior.

Sail Rock Dive Site

North of Samui, between the islands of Tao and Phangan, lies the internationally renowned dive site of Sail Rock. The summit sits just 15 m below the surface and drops to 40 m. The appeal of this site is an underwater wall over 15 m high. Divers can follow this wall rising toward the surface – a unique diving experience. Visibility is usually excellent – up to 30 m. The structure of the wall, full of crevices, provides ideal shelter for White-Eyed Moray Eels and Eels as well as large anemones. Reef Sharks and Manta Rays are often visible along with large schools of Tuna, Jacks, Trevally and Barracudas. During low season, encounters with Whale Sharks are possible.

Diving in Ang Thong National Park

Ang Thong Marine National Park is located about 30 km northwest of Samui. Popularized by the film "The Beach" with Leonardo DiCaprio – the park comprises 80 islands and offers some of the best diving available in Thailand, regardless of your level. Koh Wao and Koh Yippon are the most popular due to their scope, allowing you to swim through tunnels, caves and other passages perfect for exploration. Underwater visibility ranges from 15 to 25 m and the best diving season extends from September to January. The fact that the park is a protected area allows many rare fish species, corals and anemones to live and reproduce here.

The Hin Wong Site

Hin Wong, located east of Koh Tao, is a large, highly varied dive site with depths ranging from 10 to 30 m. The site's only drawback is its unpredictable visibility. Nevertheless, the site features delicate "Sea Fans,