Similan Islands, Thailand
intro to the Similan islands
Scuba diving the Similan Islands has got to be the highlight of any dive trip to Thailand, and for good reason. One of the best dive spots in Southeast Asia, the protected islands attract divers from around the world to explore its rich and diverse waters. A dive trip to the Similan Islands will be one you won't forget!
SCUBA DIVING THE SIMILAN ISLANDS
The plentiful marine life of the Andaman Sea is showcased in all its glory on a Similan Islands liveaboard trip. Comfortably warm waters and mild currents make for dream-like conditions, where large pelagics are often spotted feeding above the bountiful reefs.
Interested in diving the Similan Islands? You may want to check out the Andaman Islands.
Jump to:
Marine Life & Environment - Dive Sites - Best Time to Dive - Diving Conditions
How to Get There - How to Dive the Similan Islands
NEW! Find a Liveaboard - Practical Information - Book a Trip
THE SIMILAN ISLANDS DIVING HIGHLIGHTS
These world-famous islands stretch north-south in the Andaman Sea, 30 miles off the coast of southern Thailand. Covering an area of approximately 87 square miles, the nine islands of the archipelago, plus Ko Bon and Ko Tachai to the north, make up the Mu Ko Similan National Park.
The real draw here is the manta rays and whale sharks that visit the warm waters from December until April each year. Outside these months diving is still spectacular, however, with medium-sized species patrolling the bustling reefs, and plentiful macro hiding amongst the beautiful hard corals. Liveaboards in Similan Islands really do offer an amazing scuba diving experience.
THE SIMILAN ISLANDS LIVEABOARDS
The Similan Islands National Park was closed to tourists in October 2016 due to the impact of huge numbers of day-trippers, but reopened two years later and has a current cap of 3,325 visitors per day. All tourist accommodation on the islands is now closed, except for a few park-managed tents and bungalows. In addition, access to three of the islands is restricted to protect nesting turtles, and one is privately owned. As such, a Similan Islands liveaboard is the most comfortable, and by far the most convenient way to access all these intriguing islands have to offer.
For a similar liveaboard experience closer to home, check out our Caribbean liveaboards.
New to liveaboards? Check out our guide to the World of Liveaboard Diving.
Diving Information
MARINE LIFE & PHOTOGRAPHY SPECIES
Interested in macro? Check out our list of the Best Macro Destinations in the World.
Between December and April each year, manta rays and whale sharks stop-off on their migration to feed in the Andaman Sea’s plankton-rich waters. Individuals will often stick around for several weeks, and can regularly be sighted around the outer reefs and atolls.
Diving Conditions
- Water temperature: 83-87°F (28-30°C) year-round.
- Visibility: Excellent, up to 150ft.
- Depth Range: Most dives are less than 100ft.
- Diving Difficulty: There is a range of sites suitable for all levels, and many dives are easy and quite shallow.
Similan islands best diving spots
The top best dive sites in the Similan Islands. Pick a dive spot or read the entire list:
3. Ko Bon West
8. Shark Fin Reef & Boulder City
1. RICHELIEU ROCK
Fifty-five miles north of the Similan Islands, the lonely pinnacle of Richelieu Rock attracts a wealth of marine life to its spectacular corals. This site is regarded as the best dive in Thailand, due to the great diversity of marine life appearing in vast numbers. The rock’s isolated location makes it a magnet for pelagic giants such as whale sharks and mantas, as well as tuna, barracuda, trevally, and turtles. Schooling snapper and glassfish create a constant ebb and flow of movement above the dense coral reefs, which in turn hide octopus, squid, moray eels, and some superb macro.
Find out why we think Richelieu Rock is one of the world's best dive sites.
2. KOH TACHAI PINNACLE, KO TACHAI (Island 11)
In the furthest reaches of the national park, Koh Tachai Pinnacle is an exciting and challenging site best suited to intermediate and experienced divers. The dive centers around an open-ocean pinnacle and is the best place to spot passing mantas and whale sharks, as well as barracuda and trevally hunting above the granite rocks.
3. KO BON WEST, KO BON (Island 10)
This island’s limestone walls are coated in a patchwork of colorful soft corals, and a myriad of macro can be found sheltering from strong currents in the cracks and crevices. Ko Bon West is a favorite cleaning station for manta rays, who visit in the late afternoon to rid themselves of pesky parasites.
4. CHRISTMAS POINT, KO BANGU (Island 9)
Located on the northwest edge of Ko Bangu, a collection of large boulders and quirky rock formations create exciting swim-throughs and tunnels in an incredibly scenic dive. The rocks are covered in soft corals and sea fans, and a coral garden of immense pore and staghorn corals can be found in the shallower waters. Expect to see the resident school of bluefin trevally, giant sweetlips and grouper in the swim-throughs, and firey goby amongst the coral.
5. DONALD DUCK BAY, KO SIMILAN (Island 8)
This is a great macro site on the main island, and the shallow bay offers up some fascinating critters around a comically-shaped rock. Especially good for night dives, expect to spot plenty of octopus and cuttlefish as well as any number of crabs, shrimps, and other crustaceans.
6. ELEPHANT HEAD ROCK, KO BAYU (Island 7)
Sitting around a mile offshore, the ocean swell and currents around Elephant Head Rock make it another site suited to more experienced divers. The dive itself is a fascinating maze of boulders and caverns, creating hiding places for all manner of species from curious moray eels, to boxer shrimp, octopus, and the spectacular yet sinister lionfish.
7. WEST OF EDEN & DEEP SIX, KO BAYU (Island 7)
These two sites merge at the northwestern tip of Ko Bayu and are perhaps the most iconic of the Similan Islands’ dive sites. Showcasing the rich and diverse marine life of the Andaman Sea, West of Eden’s large boulders are covered in sea fans, beautiful anemones, feather stars, tube sponges, and soft coral. This gives way to the sloping reef and deeper walls of Deep Six, where pinnacles and rock clusters create a stunning backdrop. Expect to spot rays, moray eels and turtles, pelagics such as dogtooth tuna and giant trevally, and all manner of critters such as frogfish, shrimp and nudibranchs.
8. SHARK FIN REEF & BOULDER CITY, KO PAYAN (Island 3)
Just over half a mile (1kilometer) offshore at Ko Payan, Boulder City is an advanced site of large granite outcrops and huge boulders scattered across a sandy bottom. It leads round to Shark Fin Reef where further boulders and drop-offs create an exciting site. The brisk currents bring big pelagics such as mantas and whale sharks close in, and huge numbers of reef fish can also be spotted amongst the huge gorgonians and hard coral formations.
BEST TIME TO DIVE THE SIMILAN ISLANDS
The dive season of mid-October to mid-May coincides with the warmer, drier months on land, and air temperatures can reach the mid-80s (30°C) in April. The best time to spot mantas and whale sharks is between December and April.
Travel Information
How to Get To THE SIMILAN ISLANDS
Several airlines fly from the US to Thailand’s Phuket International Airport (HKT) with a layover in Europe or Asia. Once in Phuket, it’s a 90-minute drive to Khao Lak to pick up the liveaboard.
How to Dive THE SIMILAN ISLANDS
The National Park is open from mid-October through to mid-May, and the dive season runs accordingly. Liveaboards generally visit for 4-nights or 7-nights, and some combine a longer trip with a visit to the nearby Surin Islands and Richelieu Rock. Boats tend to depart from Khao Lak on the mainland, but there are also departures from Ranong and Phuket.
There is a wide range of liveaboard options, from modern motor yachts to a traditional junk. Trips range from laid-back and budget-friendly through to the more luxurious boats of the Aggressor fleet, and everything in between. Meals are often cooked by local chefs, and they are in a Thai style but cater towards western tastes.
Most boats will run 4 dives a day, including one dusk or night dive. There is also the option to snorkel between dives, and the possibility of a land-based excursion to explore the top-side wildlife.
Some Similan Islands trips also include diving in Myanmar, a unique and rarely visited destination.
OTHER THINGS TO DO IN THE SIMILAN ISLANDS
Most liveaboards will offer at least one land excursion to visit the islands’ tropical interiors. There are many nature trails and viewpoints, and some migratory birds found nowhere else in Thailand can be spotted. The white sandy beaches will take your breath away, and are perfect for an afternoon’s relaxation.
OTHER USEFUL INFORMATION
PRACTICAL INFORMATION
- Currency: Thai Baht (THB).
- Language: Thai.
- Time Zone: Indochina Time (GMT+7).
- Electricity: 230V.
LIVEABOARD AVAILABILITY
Please contact us for the latest availability of the following boats: Diva Andaman, Similan Explorer, MV Hallelujah, Dolphin Queen, Deep Andaman Queen, MV Giamani, DiveRACE, MV Oktavia, and MV Pawara.
GOT QUESTIONS? READY TO BOOK?
Call us today at +1-310-915-6677 or email us info@bluewaterdivetravel.com
And let us book your dream vacation!
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