Richelieu Rock

This beautiful rock offers spectacular diving experiences due to its richness in aquatic life, from Guitar Sharks all the way down to the little Sea Horses. Located some 20 kilometers to the southeast of the Surin Islands, Richelieu Rock can fulfill all your liveaboard diving dreams. This is by far the best dive site in these waters, including the rest of Thailand, though its reputation stretches even further to the entire globe. As a diver, you’re in for the sensation of a lifetime!

Richelieu Rock is covered with all kinds of thick layers of corals, so much so that in places its even hard to see the rock beneath them. As the limestone horse-shoe shaped pinnacle slopes abruptly down to the sandy bottom, the corals increase in size and colour formations. On the south side, the site slopes gently to deeper waters where the small caves created will give the more adventurous diver exciting swim-throughs. The center of the pinnacle provides beginners with shelter from any difficult conditions they have not yet been trained to manage.

Such difficulties may include currents, which can get quite strong as Richelieu Rock dive site is, for the most part, completely exposed. Nevertheless, the rich aquatic life and frequent, fascinating views of Whale Sharks and Manta Rays, bring live aboard divers back to this site time and time again.


Richelieu Rock Dive Site Details

Recommended live aboard diver certification: Beginner

Maximum depth: 35 meters

Visibility: 20+

Temperature: 27+

Divesite marine life: around the dive site one finds many kinds of Snappers and Trevallies, Blue Powered Surgeon Fish, Sea Horses, Cheveron Barracudas, Turtles, and many types of Moray Eels such as the Shy Dragon or the Giant Yellow Edged Moray and the Zebra and Honeycomb Morays, as well as Guitar Sharks. Here you can find nearly all kinds and colours of coral reef fish, like Butterfly Fish, Angel Fish and Groupers.


More Outer Similan Island Dive Sites

MV Oktavia

The MV Oktavia was originally built in 2003. The liveaboard vessel was then fully renovated in 2007 to provide even more comfort and space for scuba divers. The M/V Oktavia is 30m long and 6,5m wide. The size and weight of this great liveaboard boat makes it very steady in the sea even in rough waters. An extra large dive deck allows for much space to gear up and to comfortably enter the water. Oktavia is a quit boat with a wooden hull that effectively reduces the engine noise. Of course, safety is top priority and M/V Oktavia fulfills all international safety standards.

MV Oktavia offers two very large and comfortable master en-suite cabins and 13 “blue ocean cabins”, large cabins with ample space which are all equipped with air conditioning, fan, reading lights and large panorama windows. Usually there are only two guests per cabin, unless a family chooses one of the triple bed family cabins. This live aboard boat is very attractive for families with children and groups. M/V Oktavia is one of the biggest boats cruising the Similan and Surin Islands which means more leisure space and no cramped areas with a maximum of 20 diving or non diving guests on board it allows less than half of what the boat originally was built for. The staff of the M/V Oktavia welcomes babies and children of any age and will take good care for them while the parents can fully enjoy diving in the Similan Islands. The Swedish owners are always on the boat, ensuring that the ship is well maintained and guaranteeing a high service level

The huge sun deck of the Oktavia lets you enjoy stunning views over the Similan and Surin Islands and spectacular sunsets in the Andaman Sea. The “Party Deck” offers comfortable sitting space with lots of large and comfortable armchairs and sofas for reading books, sharing diving adventure stories and eating. Speaking of which; excellent food is served from breakfast to lunch and dinner. The crew of the M/V Oktavia guarantees small dive groups with max 4 divers per guide – and divers are split according to experience and comfort level. The max. dive time is 1 hour (everywhere else 50 minutes). Scheduled are 4 fantastic dives per day including the choice between sunset- or night dive (only 3 dives on day 5)


Liveaboard Cruise Options / Itinerary 2 Days / 2 Nights 3 Days / 2 Nights 5 Days 5 Nights
Depart: Day 0 Depart: Day 3 Depart: Day 0
Return: Day 2 Return Day 5 Return: Day 5
DAY 0 At 16:00 departure with M/V OKTAVIA.      
Overnight at Similan 4      
DAY 1 Similan 4-7      
Overnight at Similan 4      
DAY 2 Similan 7-9 Return trip with speedboat 15:00. Arrive Khao Lak at 17:00.    
Overnight at Similan 8      
DAY 3 Similan 9, Koh Bon, Koh Tachai   Departure with Speedboat at 08:00. Arrive at MV Oktavia at 09:30.  
Overnight at Koh Tachai      
DAY 4 KohTachai,      
Surin Islands
Overnight at Surin Islands      
DAY 5 Surin Islands, Richelieu Rock      
Return with M/V OKTAVIA.     Arrival in Khao Lak at 18:30



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Outer Similans

Within the Similan Islands National Marine Park, one finds incredible dive sites, such as Koh Bon and Koh Tachai, which are geologically separate from the near by Similan islands. They are famous for their pelagic sightings and also provide opportunities for thrilling night diving. Their wonders however do not end there. Read detailed descriptions of these sites below, to have a sense of the unimaginable wealth of aquatic life that awaits you, when you book one of our liveaboard yacht charters, with our company Island Cruises.

Richelieu Rock is a spectacular, world famous dive site quite further away from the Northern Similan Islands.

It is part of the Surin Islands National Park, but we have included it in our Outer Similans page, as it is typically included in most of our Similan Island liveaboard diving packages.

All of these dive sites attract large numbers of all sizes of colourful fish and rich gardens of many kinds of corals and little critters. You will without a doubt be amazed at what you see and will be dreaming of your next scuba diving live aboard adventure before you even return home.


Outer Similan Island Dive Sites