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Similan Islands Dive Sites – Complete Guide from Khao Lak
Similan Islands Diving – Thailand’s Top Dive Destination
The Similan Islands are located about 70 kilometers west of Khao Lak, and are world-famous for offering some of the best diving in Thailand. This group of nine granite islands, protected as a national marine park, is known for its crystal-clear water, colorful coral reefs, and incredible marine biodiversity.
Diving in the Similan Islands means exploring dramatic underwater rock formations, swim-throughs, and thriving coral gardens filled with tropical fish. You might spot manta rays, whale sharks, turtles, and even playful reef sharks. With visibility often reaching 30 meters or more, the Similans are a dream destination for underwater photographers and diving enthusiasts of all levels.
In addition, nearby dive areas such as Koh Bon and Koh Tachai are also part of the Similan National Park. They offer some of the region’s most exciting diving.
The Similan Islands are open for diving from mid-October to mid-May and can be explored on day trip diving excursions or multi-day liveaboard cruises departing from Khao Lak.
Popular Similan Islands dive sites include Elephant Head Rock, West of Eden, Deep Six, and many more.
West of Eden – A Colorful Coral Garden in the Similan Islands
Located on the western side of Similan Island No.7, West of Eden is one of the most beautiful and diverse Similan Islands dive sites. The site combines dramatic granite boulders, healthy coral gardens, and a fantastic variety of marine life making it a favorite among underwater photographers and experienced divers alike.
The dive begins over large rock formations covered with soft corals, sea fans, and sponges in every color imaginable. As you move deeper, you’ll explore sandy patches and coral bommies that shelter ornate ghost pipefish, ribbon eels, nudibranchs, and juvenile sweetlips.
It’s common to see octopus, moray eels, and turtles here, along with schools of fusiliers and snappers gliding through the blue. The gentle currents make this site ideal for a relaxed but exciting dive.
Depth: 5–30 meters
Level: Suitable for Open Water and Advanced divers
Highlights: Vibrant corals, macro life, reef fish, turtles
Best time to dive: November to April
Whether you’re exploring West of Eden on a day trip from Khao Lak or a Similan liveaboard, this site delivers everything that makes diving in Thailand unforgettable: color, life, and a touch of adventure.
Elephant Head Rock – The Icon of Similan Islands Diving
Elephant Head Rock, known locally as Hin Pusa, is one of the most famous dive sites in the Similan Islands and a must-visit for any experienced diver. Located between Similan Island No.7 and No.8, the site is easily recognized by the large granite boulders that break the surface resembling an elephant’s head rising from the sea.
Below the surface, Elephant Head Rock reveals an exciting underwater maze of swim-throughs, arches, and canyons, covered with soft corals and sea fans. The site is full of marine life. Look out for white-tip reef sharks, giant trevallies, moray eels, tunas, and schools of bannerfish and fusiliers swirling around the rocks.
Macro enthusiasts can also find nudibranchs, shrimp, and pipefish hidden in the cracks and coral. Stronger currents here attract pelagic species, adding an extra thrill to every dive.
Depth: 12–40 meters
Level: Advanced divers
Highlights: Swim-throughs, reef sharks, big fish action, dramatic rock formations
Best time to dive: November to April
Diving Elephant Head Rock is an unforgettable experience that showcases everything the Similan Islands are famous for adventure, beauty, and world-class marine life. Whether you’re joining a day trip or liveaboard from Khao Lak, this site is often the highlight of the journey.
Deep Six – Granite Pinnacles and Big Fish Action
Deep Six lies near Similan Island No.7. It is one of the most exciting and visually striking dive sites in the Similan Islands.
The site features dramatic granite pinnacles that rise from deeper water toward the surface. These formations create a unique underwater landscape.
As you descend, you explore large boulders covered with soft corals, sea fans, and sponges. Schools of fusiliers and snappers gather around the pinnacles. Trevallies and barracudas cruise in the blue. You may also spot reef sharks passing through.
Currents range from mild to strong. This makes every dive slightly different. Deep Six suits confident Open Water divers and above.
Depth: 12–40 meters
Level: Open Water (comfortable) to Advanced
Highlights: Granite pinnacles, schooling fish, reef sharks
Best time to dive: November to April
Deep Six offers a great mix of structure, marine life, and classic Similan scenery on both day trips and liveaboards.
Koh Bon Ridge – Manta Rays and Deep Drop-Offs
Koh Bon Ridge is one of the most famous dive sites in the Similan area. It lies north of the main islands and is known for its deep drop-offs and strong currents.
The ridge slopes into deep blue water. This attracts large pelagic species. Manta rays are often seen here, especially during the high season. You may also spot barracudas, trevallies, and reef sharks.
The reef itself features hard corals, overhangs, and sandy patches. Schools of fish gather along the ridge, creating constant movement and action.
Currents can be strong and unpredictable. For this reason, Koh Bon Ridge is best suited for Advanced divers or confident Open Water divers with experience.
Depth: 18–40 meters
Level: Advanced or experienced Open Water
Highlights: Manta rays, pelagic fish, deep drop-offs
Best time to dive: December to April
Koh Bon Ridge offers some of the best chances to encounter manta rays in the Similan Islands. It is a highlight of many liveaboard trips.
Koh Tachai Pinnacle – Big Fish and Strong Currents
Koh Tachai Pinnacle is one of the most exciting dive sites in the Similan area. It sits in open water and rises from deep below the surface.
As a result, the pinnacle attracts large schools of fish. In addition, it is covered with soft corals, sea fans, and anemones. You can often see barracudas, trevallies, and tuna hunting in the blue.
Furthermore, the site is known for big marine life. With some luck, you may spot manta rays or even whale sharks passing through.
However, conditions can be challenging. Currents are often strong, and the dive can be deep. For this reason, Koh Tachai Pinnacle is best suited for Advanced divers.
Depth: 18–40+ meters
Level: Advanced
Highlights: Big fish action, strong currents, manta rays, whale sharks
Best time to dive: December to April
Overall, Koh Tachai Pinnacle is a highlight of many liveaboard trips and offers some of the most thrilling diving in the Similan region.
Surin Islands Diving – Remote Beauty and Richelieu Rock
Located north of the Similans near the Myanmar border, the Surin Islands offer a more remote and peaceful diving experience. This marine national park is famous for its untouched nature, healthy coral reefs, and the legendary Richelieu Rock often ranked among the top 10 dive sites in the world.
Diving in the Surin Islands is a chance to encounter whale sharks, barracuda schools, trevallies, and colorful soft corals. The area’s gentle currents and clear water make it ideal for both beginners and experienced divers looking for unforgettable underwater adventures.
In addition to world-class diving, the Surin Islands are home to the Moken “Sea Gypsy” community, adding a unique cultural experience to your visit.
Most Surin Islands dive trips and liveaboards depart from Khao Lak, making it easy to visit famous sites like Richelieu Rock on both day trip diving excursions and liveaboard adventures.
Popular dive sites include Richelieu Rock, Aow Pakard, and Torinla Pinnacle.
Richelieu Rock – The Crown Jewel of the Andaman Sea
Richelieu Rock is the most iconic dive site in the Surin National Park and one of the top dive destinations in the world. Rising from deep blue water in the middle of the ocean, this horseshoe-shaped limestone pinnacle is famous for its incredible biodiversity, dramatic scenery, and unforgettable marine encounters.
The site is covered with vibrant purple soft corals, sea fans, and anemones that create a stunning underwater landscape. Divers can expect schools of trevallies hunting, swirling barracudas, large groupers, and an incredible mix of macro life hiding among the cracks and overhangs including harlequin shrimp, ghost pipefish, seahorses, and colorful nudibranchs.
Richelieu Rock is also known for big-animal surprises. While sightings are not guaranteed, this is historically one of the best places in Thailand to encounter whale sharks. Even without the big visitors, the site delivers exceptional diving with rich marine life from start to finish.
Because of its position in open water, currents can range from mild to strong. For this reason, Richelieu Rock is best enjoyed by advanced divers or confident Open Water divers with experience.
At YU Dive Khao Lak, we take small groups and time our dives to ensure the best possible visibility, conditions, and overall experience.
Aow Pakard – The Hidden Gem of the Surin Islands
Aow Pakard is one of the most peaceful and scenic dive sites in the Surin Islands, known for its gentle conditions, bright coral gardens, and excellent visibility. This sheltered bay offers a relaxed diving experience with a stunning mix of hard corals, sandy patches, and scattered boulders that create a beautiful, easy-to-navigate underwater landscape.
The site is perfect for divers who enjoy slow, detailed exploration. Schools of fusiliers and snappers drift above the reef, while parrotfish and angelfish graze along the coral formations. Macro lovers will find plenty to enjoy here too, from nudibranchs and cleaner shrimps to small pipefish and juvenile reef species hiding among the corals.
Green and hawksbill turtles are frequently spotted cruising through the bay, and the calm conditions make Aow Pakard ideal for photographers. With minimal current and excellent light, this dive site offers long, comfortable dives suitable for all experience levels.
For divers looking for a relaxed and colourful Surin Islands experience, Aow Pakard is a true hidden gem.
How to Dive the Similan & Surin Islands
There are several ways to explore the incredible dive sites of the Similan Islands and Surin Islands.
Day trips from Khao Lak are a great way to explore the Similan Islands in just one day. They include comfortable speedboat transfers and multiple dives.
Similan & Surin Liveaboard Trips
Liveaboards allow divers to explore a wider range of dive sites including Koh Bon, Koh Tachai and the world-famous Richelieu Rock.
Another option is a flexible overnight diving trip on a platform. It stays within the national park and visits multiple dive sites.
Similan & Surin Islands Diving – Frequently Asked Questions
The diving season in the Similan and Surin Islands usually runs from mid-October to mid-May. During this period, the Andaman Sea offers calm conditions and excellent visibility. It’s also the best time to encounter manta rays and whale sharks.
Yes. Many dive sites in the Similan Islands are suitable for Open Water divers. Sites like coral gardens and sheltered reefs offer gentle conditions, while more advanced sites provide exciting dives for experienced divers.
The most famous dive site in the Surin Islands is Richelieu Rock. It is considered one of the best dive sites in Thailand. It is known for its vibrant soft corals, incredible biodiversity, and occasional whale shark encounters.
Yes. Many divers visit the Similan Islands on day trips departing from Khao Lak. The Surin Islands and Richelieu Rock are usually explored on longer day trips or liveaboard diving cruises.
Divers frequently encounter reef sharks, turtles, barracudas, trevallies, and large schools of tropical fish. The area is also famous for manta rays and occasional whale shark sightings, especially around Richelieu Rock.
Plan Your Similan Islands Diving Adventure
Choose a day trip, liveaboard, or overnight diving program. The Similan and Surin Islands offer some of the best diving in Thailand.
Contact YU Dive Khao Lak today to plan your next underwater adventure in the Andaman Sea.
What Our Customers Say
Aleks, the owner and our guide, is absolutely fantastic. Super relaxed, incredibly competent, and you can immediately tell how much experience and passion he has for diving. We felt safe and completely comfortable with him at all times.
I’d had some trouble equalizing the pressure since my last dive in Marsa Alam, but that wasn’t an issue at all. He gave me all the time I needed and didn’t stress me out.
The 12 dives were amazing, beautiful spots, and so much marine life. Exactly what you want!
He organized everything perfectly.
For us, definitely one of the best diving experiences ever – we’ll be back! 🤿💙 A clear recommendation for anyone who wants to dive in Khao Lak!
I completed my PADI Open Water certification with Yu Dive and had a fantastic experience. With planning the trip, Alek was helpful and responsive, and was able to accommodate my request to combine the training with a trip to the Surin Islands. I ended up completing the course on an overnight liveaboard, which was a great way to learn, and we also got to dive at Richelieu Rock.
Alek was a great instructor – calm, clear, and easy to learn from. I felt safe and comfortable throughout the training. He also knew the reef well and pointed out some really nice marine life and dive spots along the way.
Thanks again for everything Alek! Hope to dive with you again in the future!
Alek went above and beyond for us. Extremely good communication throughout. Very thorough and professional Open Water paid course. Good knowledge of the reef and dive conditions in every briefing.
Would book with Yu Dive again.
The dive sites themselves are absolutely stunning, with beautiful underwater scenery and unforgettable marine life encounters. Every trip feels thoughtfully planned to give you the best possible experience.
A special mention has to go to Aleks, who is outstanding. Friendly, professional, and always communicating clearly, Aleks makes everything smooth and enjoyable, whether you’re a beginner or an experienced diver.
Overall, Yu Dive Khao Lak delivers a 5-star experience in every way. Highly recommended!
Travelling from the UK I searched online and found Yu Dive in Khao Lak. Messaged to obtain information prior to leaving the UK and received attentive, helpful and friendly responses from Aleks.
I hadn’t dived for a couple of years so needed a refresher for an advanced PADI licence. All arranged without issue with a local dive to refresh for a fabulous boat dive out to the Surin islands a few days later. Transport and top quality scubapro dive gear provided which was pretty much brand new.
I would recommend Yu Dive and Aleks to anyone looking for diving in the area. Nothing was too much trouble and was well organised.
Thank you!
We particularly want to highlight the amazing snorkeling experience. It was a joy to see so many different types of colorful fish while observing the vibrant corals. We were even lucky enough to spot some large sea turtles!
The beaches and the sea are truly beautiful – like a paradise. We enjoyed the phenomenal natural scenery, and the overall nature within this national park is stunning. It was a memorable day and we highly recommend their services to anyone visiting the area.
During her first dive she experienced some panic attacks, but Aleks calmly reassured her, gave her time to relax, and returned to the water with her an hour later — and she succeeded. His teaching style is supportive, confidence-building, and truly top-notch.
After the course, we also completed two-tank dives with him in the Similan Islands, and the experience was fantastic from start to finish.
Thank you for teaching Rymma, Aleks — you did a fantastic job! We hope to dive with you again soon.
This is not the first we were diving with Aleks. Every time we get under the water with Aleks the feeling is the same that you will know you are in good hands. He is caring, considerate, patient, familiar with diving area. He took care of everyone not only in the water, but start from the pier, on the boat and after dive. You will feel safe, comfortable and built-up confident to dive with him.
And, this time we were doing the AOW course with him. We enjoy the time spend with him and bring us such a great memories. Thanks for showing us a glimpse of the best of under sea in the area.
It just can’t enough for saying. Simply go & dive with him. A great caring and encouraging Serbian Dive Instructor & Dive Guide.
Hvala puno.
We felt all of that while diving with Yu Dive Khao Lak and Aleksandar, our instructor.
Thank you, Sale, for your patience, experience and knowledge, which made it possible for me to relax completely and enjoy my own “underwater feature film.” I’m grateful to you for helping me push the boundaries of what I thought was possible once again!
See you next year!
We stayed on a liveaboard and were extremely satisfied: the equipment is new, the crew is always ready to help, and the accommodation and food are exceptional.
We also ventured into the jungle, slept in complete wilderness, and enjoyed all the beauty of untouched nature.
I wholeheartedly recommend YU Dive, especially to people from the former Yugoslavia, because sharing the language — and the mentality — makes the whole experience even better.
The preparation for each dive was concise and relevant. During diving he was very attentive, and he monitored us very closely, therefore I felt very safe at each moment. I would definitely recommend Saša as an experienced dive master. I plan to come to Saša’s diving school again and continue this amazing underwater journey.
He pays incredible attention to detail and always makes safety the top priority, which helped me feel completely comfortable throughout the entire course.
If you’re looking for a knowledgeable, professional, and genuinely supportive diving instructor, I can’t recommend Saša enough. Truly outstanding!
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Discover the best diving spots.
Begin your adventure by exploring the stunning dive sites around Khao Lak, where vibrant marine life and crystal-clear waters await. Our daily trips cater to divers of all levels, ensuring a memorable experience for everyone.
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Enjoy a day filled with diving and adventure.
Experience the thrill of diving in some of the most beautiful locations, including the Similan Islands and Surin Islands. Our experienced guides will ensure your safety and enjoyment throughout the day, making it a perfect outing for both beginners and seasoned divers.
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Frequently Asked Questions
What are the best diving spots?
The best diving spots include the Similan Islands, Surin Islands, and Richelieu Rock, known for their vibrant marine life and stunning underwater landscapes.
What should I bring for a day trip?
For a day trip, bring sunscreen, a hat, swimwear, a towel, and a refillable water bottle. We provide diving gear, but feel free to bring your own if preferred. Don’t forget your camera to capture the beautiful moments!
How long do the daily trips last?
Daily trips typically last around 8 to 10 hours, including travel time and diving.
Is food provided on the trips?
Yes, lunch is included in our daily trips, featuring a selection of local Thai dishes to keep you energized throughout the day.
What is the maximum group size for diving trips?
Our daily diving trips maintain a maximum group size of 4 divers per guide, ensuring personalized attention and safety for all participants.