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Similan Islands Liveaboard Diving

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Liveaboard Diving in Similan Islands

What To Expect On a Similan Islands Liveaboard

Liveaboards in Similan Islands will take divers to the most well-known dive areas in the amazing dive destination of Thailand. The Similan Islands are ranked as one of the top dive destinations in the world. Made up of 9 granite islands, located 100 km Northwest of Phuket and 65km offshore from Phang Nga Province in the Andaman Sea, the Similan Islands were declared a National Park in 1982 and offer scuba divers exceptional diving adventures. Similan Island liveaboards will visit dive sites that feature varied landscapes and vibrant marine life. Massive boulders, caves, reefs and passages are home to over 500 species of hard and soft corals and astonishing pelagic life. The East Coast boasts exceptional visibility and weak to moderate currents while the West Coast waters are deeper with stronger currents. With such varied dive sites, the best way to enjoy the Similan Islands is on a premier dive liveaboard.

Similan Islands Underwater

The landscape of the Similan Islands is a feast for the eyes both above and underwater. From the tropical white sandy beaches and clear blue waters to the granite boulders on land and underwater, it is a paradise difficult to surpass and understandably one of the most popular dive locations in the world. It is becoming ever more popular to take a dive safari on a liveaboard due to easy access to these remote islands. An abundant marine life roams the subterranean landscape of these islands. It is common to see leopard sharks, guitar rays, whitetip sharks, blue-spotted stingrays, clown triggerfish, rabbitfish, scorpionfish, snappers, emperor fish, giant trevally and angelfish. Turtles and giant bump head parrotfish make their appearances and the sharp-eyed diver may find tiny ghost pipefish, mantis shrimps, porcelain crabs or cleaner shrimp. To dive amongst the boulder formations and see their impressive size underwater is truly wondrous.

Dive Sites Of Similan Islands

Similan Liveaboard itineraries may vary but some popular dive sites include:

Anita's Reef on the east coast, just off Similan Island No.4 boasts impressive coral formations, boulders this subterranean landscape provides a sanctuary for a very diverse marine life. From hunting Bluefin trevally, yellowfin goatfish, blue damsels to the very common shrimp gobies, the easy currents allow for a great first dive option for most dive trips.

West of Eden, also known as West of Six for its location to the north-west corner of Island number 6, enjoys a healthy hard coral reef and massive granite boulders. Batfish, Turtles and Octopus are common residents to the reef. Through the rocky channels, frogfish, ribbon eels, giant morays and barracudas can also be seen. Keep an eye out in the blue for passing larger pelagics.

Elephant Head Rock, named after a rock that jets out of the water visible from the surface, this is the biggest pinnacle in the Similans and has some fantastic swim-throughs. A more challenging dive site due to strong currents, you may see white tip reef sharks, batfish, trevally and barracuda can often be seen on the perimeter of the boulders and the avid macro photographer can look out for smashing mantis shrimp, fire gobies, porcelain crabs and cleaner shrimps.

Donald Duck Bay, is a popular night dive spot on the north-west corner of Island no.8. Named after a rock resembling the cartoon character, this site is great for macro lovers. The boulders are home to emperor shrimps, red round crabs, decorator crabs, triton shells and cone shells, bull crabs, red octopus and cuttlefish and green turtles

Boulder City, is a large submerged granite outcropping, about 1km off the east coast of island no.3 with jumbles of boulders scattered around a flat sandy bottom. A slightly more advanced dive site, the current can sometimes bring the whale sharks and manta rays.

Shark Fin Reef - As is prevalent in the Similans, this dive site consists of another series of granite boulders covered in gorgonians and hard corals with a great diversity of marine life including the Napoleon wrasse, turtles, boxfish, clown triggerfish, schools of batfish, yellow goatfish, palette surgeonfish, blue-faced angelfish and bannerfish amongst others.

Honeymoon Bay lies to the northwest of Island 5. Its sheltered location, it is a popular place for boats to moor and include a night dive. This is when the Reef crabs, shrimps, lobsters, cuttlefish and nurse sharks all come out, leaving their crevices looking for food. With an average depth of 15-20 meters, the reef is decorated with hard corals, keep an eye out for shy garden eels on the sandy bottom.

Christmas Point, true to its name, is one of the most colourful, scenic dives in the islands on the far west side of Similan Island 9. This outcropping is home to several giant archways which provide superb topography and forms some of the best swim-throughs in the Similans.

Other dive sites include: Three Trees, Beacon Point, Breakfast Bend, Chinese Wall, Coral Reef, Deep Six, Hideaway, Deep six, North Point and Stonehenge.

Top Tips For Divers

Thailand liveaboard trips to the Similan Islands run from November through to May. The Islands are closed for the rest of the year. The end of February often sees an increase in currents attracting the larger marine creatures like whale sharks and manta rays. Visibility ranges from 25-40m during this period and water temperatures range between 26-29c. You may not need more than a 3mm neoprene shorty or full body wetsuit bearing in mind after a 3 or more dives a day, you may get cold. If you are bringing your own equipment, consider bringing a DIN adapter (if you have DIN regulators) as Thailand uses the standard yoke system.

Getting To Similan Islands

Please check your individual liveaboard itinerary carefully and be aware of different departure ports depending on your liveaboard chosen. Liveaboard cruises may depart from Chalong Pier in Phuket, Thap Lamu Pier in Khao Lak, Phang-Nga Province. Transfers to the port are provided from Phuket International Airport or your hotel. Please notice some liveaboards may even depart from one port and return to another, i.e depart from Phuket and return to Khao Lak. Some International flights fly directly to Phuket or you can get a connecting flight from Bangkok.


The Similan Islands offer scuba divers the opportunity to get up close and personal with whale shark, leopard sharks and manta rays.


Similan Islands Diving Reviews

  • Rating 9.1 out of 10
  • 9.1 Superb
  • Rating 10.0 out of 10
  • 10.0 Exceptional
  • Emma R
  • Flag of United StatesUnited States

Amazing diving with tons of fish and beautiful corals. No whale shark sightings but sea turtles, reef sharks, and the cutest yellow baby boxfish!

Diving Similan Islands in April on the Lapat
  • Rating 10.0 out of 10
  • 10.0 Exceptional
  • Evgeny K
  • Flag of United StatesUnited States

very comfortable beginning of 4 night trip, with mantas and some big fishes

Diving Similan Islands in March on the Andaman
  • Rating 9.6 out of 10
  • 9.6 Exceptional
  • Jared H
  • Flag of United StatesUnited States

Great! Gentle waters, beautiful reefs.

Diving Similan Islands in February on the Manta Queen 1
  • Rating 10.0 out of 10
  • 10.0 Exceptional
  • Elizabeth E
  • Flag of United StatesUnited States

Excellent! Water was clear and there were a million fish. Coral was beautiful and colorful.

Diving Similan Islands in January on the Stingray


What to know about diving in Similan Islands

How do you get to the Similan Islands?

Most visitors depart by speedboat from Thap Lamu Pier near Khao Lak (about a 30-minute drive from Khao Lak, or 2–2.5 hours from Phuket), with the crossing itself taking roughly 1 to 1.5 hours. Liveaboards depart from the same piers for multi-day trips.

Where are the Similan Islands?

The Similans sit in the Andaman Sea about 40 miles (65 km) off Khao Lak in Phang Nga province, forming a chain of 11 granite islands within Mu Ko Similan National Park.

What country do the Similan Islands belong to?

The Similan Islands belong to Thailand and are administered as a national park by the Department of National Parks, Wildlife and Plant Conservation.

How far is Similan Islands from Phuket?

The islands are roughly 40 miles (65 km) northwest of Phuket, with most boats instead departing from the closer pier at Khao Lak to cut down the crossing time.

What does "Similan" mean?

"Similan" comes from the Malay word for "nine" (sembilan), reflecting the nine original islands in the chain before two more were added to the national park in 1998, bringing the total to 11.

When are the Similan Islands open?

The park is open from October 15 to May 15 each year and closes completely during the southwest monsoon; as of 2026, closure dates can shift slightly with weather, so it's worth confirming exact dates before booking a trip near the season's edges.

What is the entrance fee for the Similan Islands?

As of 2026, the national park entrance fee for foreign adults is 500 baht (about $15), separate from any boat transfer or liveaboard trip cost.

What are the best dive sites in the Similan Islands?

Elephant Head Rock, Christmas Point, Boulder City, East of Eden, and Anita's Reef are among the most popular, offering a mix of granite boulder swim-throughs, walls, and reef slopes with frequent turtle and reef shark sightings.

Can you stay overnight on the Similan Islands?

Basic national park bungalows and camping are available on Similan Island (Island 8) and Miang Island (Island 4), though most divers instead stay aboard a liveaboard anchored offshore for the duration of their trip.

What marine life can you see diving the Similan Islands?

Expect hawksbill and green turtles, reef sharks, barracuda, and colorful reef fish among the granite boulders, with manta rays and whale sharks possible at the northern sites closer to Koh Bon and Koh Tachai.

How many days do you need for a Similan Islands liveaboard?

Most liveaboards run 3 to 4 nights for a solid tour of the Similans alone, or 6 to 7 nights on itineraries that extend north to Koh Bon, Koh Tachai, and Richelieu Rock as well.

Is snorkeling good in the Similan Islands?

Yes — many of the shallower bays, like those around Islands 7 and 8, have healthy coral just a few feet down, making them popular for snorkeling day-trippers as well as scuba divers.

What's the water temperature at the Similan Islands?

Water runs a comfortable 82–86°F (28–30°C) through most of the November–April season, warm enough that a 3mm wetsuit is standard gear for most divers.

Why do the Similan Islands close every year?

The park closes from roughly mid-May to mid-October both because the southwest monsoon makes the crossing unsafe and to give the reefs and beaches a recovery period from the high-season crowds.

Are the Similan Islands good for beginner divers?

Many sites, like the sheltered bays around Islands 7 and 8, are gentle enough for newer divers, while others, like Christmas Point and the northern extension sites, have stronger currents and suit more experienced divers — most liveaboards mix both across a trip.

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