Extending between the Andaman Sea and the Gulf of Thailand, Thailand has firmly cemented its reputation as one of the world's premier scuba diving destinations. Divers of all skill levels flock to this tropical paradise to discover its diverse marine ecosystems, including beginners looking to earn their open-water certification and experienced divers in search of new challenges.
Many of Thailand’s top dive destinations boast a spellbinding blend of hard and soft corals that provide a habitat for a dizzying array of tropical fish. Aside from the opportunity to encounter majestic pelagic species like whale sharks and manta rays, there’s an abundance of smaller marine life that will appeal to macro enthusiasts.
Thailand's dive centres and instructors enjoy a stellar global reputation, making it an ideal destination to earn your scuba certification or further develop your skills. Not only that, but the above-water scenery is sublime and the resorts are world-class, with many showing an ever-increasing commitment to sustainability.
In this article, we’ll help you plan an eco-friendly dive vacation in Thailand, whether you want to hit the scuba schools of Koh Tao or venture to the Similan Islands on a liveaboard adventure. In addition to highlighting 6 of the best places to dive in Thailand, we’ll share eco-friendly resorts in each destination to ensure a sustainable stay.
This article contains affiliate links, which means when you make a purchase through that link, we earn a small commission. Affiliate links come at no cost to you and ensure our content remains free!
6 of the best places to dive in Thailand
Surin Islands
Best place for remote diving in Thailand
Tucked away in the remote reaches of the Andaman Sea lies the breathtaking Surin Islands, a protected archipelago that has been designated as a UNESCO Environmental Program site. This untouched tropical paradise beckons intrepid divers and snorkellers seeking to discover a vibrant underwater world teeming with unique marine life and dazzling coral formations.
Accessible only by liveaboard, the Surin Islands are best explored on an itinerary spanning four to seven nights. This allows ample time to fully explore the region's diverse dive sites, which boast an incredible array of hard and soft corals in a rainbow of mesmerising hues. The remote location of the Surin Islands means fewer crowds, enabling you to spot rare and elusive species that are harder to find in Thailand's more popular diving destinations.
The jewel in the crown is undoubtedly Richelieu Rock, a horseshoe-shaped reef that attracts majestic whale sharks and shy seahorses. Collectively, the Surin Islands are protected within Mu Ko Surin National Park, which is closed to visitors during the off-season (May to October) to ensure the preservation of this underwater paradise.
Similan Islands
Best place to dive in Thailand with whale sharks
Around 100 kilometres south of the Surin Islands is another scuba diving mecca, the glorious Similan Islands. This stunning archipelago lies off the coast of Khao Lak and encompasses some of Thailand’s most sought-after dive sites. A liveaboard trip to the Similans is a must for any serious diver and can be combined with a longer itinerary including the Surin Islands.
Massive granite boulders rise dramatically from the seafloor, creating a dramatic backdrop for encounters with curious reef sharks and schools of tropical fish. The real showstoppers, however, are the vibrant coral formations that explode with colour, forming majestic gardens that are a photographer's dream.
Many divers heading to the Similans are particularly drawn to the possibility of spotting manta rays and whale sharks, both of which are known to frequent these nutrient-rich waters. With their warm temperatures, excellent visibility and easy diving conditions, the Similan Islands offer an exceptional scuba experience, making them one of the best places to dive in Thailand.
Eco-friendly dive liveaboards in the Surin and Similan Islands
Andaman Scuba
With an extensive fleet of state-of-the-art vessels, Andaman Scuba offers immersive three- to eight-day dive trips to the Similan and Surin Islands, including Richelieu Rock. It caters to divers of all skill levels, from complete novices to seasoned underwater explorers. But Andaman Scuba is more than just a dive company - it is a dedicated steward of the marine environment, committed to sustainable practices that minimise its ecological footprint. The company adheres to international charters on sustainable diving and shark ecotourism, and onboard, guests are encouraged to embrace "leave no trace" and "touch only with the eyes" policies.
Best places to dive in Thailand
Koh Tao
Best place to dive in Thailand for beginners
Nestled in the Gulf of Thailand, the small island of Koh Tao has earned a well-deserved reputation as one of the best places to get certified as a diver in Thailand. Situated between the larger tourist hubs of Koh Phangan and Koh Samui, it is home to an abundance of dive operators, offering everything from beginner courses to specialty certifications for those looking to hone their diving skills.
The calm, shallow waters around Koh Tao provide the perfect environment for beginner divers to complete their Open Water certification in safety and comfort. From large schools of tropical fish to the occasional appearance of whale sharks, there is always something captivating to see on a Koh Tao dive. Additionally, there are more challenging deep and drift dives that will appeal to experienced enthusiasts.
Koh Tao is home to an astounding number of dive shops, all competing to provide the best instruction, equipment and overall experience for their customers. From PADI and NAUI certification courses to specialty programs in areas like underwater photography, Koh Tao's dive schools cater to every diver's needs and interests.
Best eco-friendly dive resorts on Koh Tao
An aerial view of the swimming pool at the Jamakhiri Dive Resort & Spa on Koh Tao (photo courtesy of Expedia)
Eco-friendly hotels on Koh Tao
Set along picturesque Thian Og Bay, this eco-friendly Koh Tao resort provides luxury accommodations with a focus on sustainability and minimising environmental impact. The Thai-inspired rooms and pavilions feature private balconies that boast stunning ocean views while the onsite dive centre offers 16 different dive courses. Jamahkiri has implemented a range of initiatives to reduce its carbon footprint, including the use of a desalination plant to provide clean water and the implementation of renewable energy sources.
"10/10 luxury experience.” - Matilda (read more reviews here)
Best eco-friendly dive resorts Koh Tao
An open-air dining space overlooking the pool at Ecotao Lodge (photo courtesy of Expedia)
Constructed using wood, bamboo and other natural materials, this sustainable hotel on Koh Tao lies surrounded by jungle on the island’s east coast. There are magnificent ocean views on offer from its private balconies, swimming pool and restaurant where you can dine on gourmet Thai cuisine. Not only that but this eco-friendly Koh Tao hotel takes its environmental commitment seriously, from waste management to energy usage.
"Amazing eco-friendly hotel. The cabins are spacious and stylishly decorated. Staff are wonderfully attentive and caring.” - Alwin (read more reviews here)
Plan an eco-friendly dive vacation in Thailand
Koh Phi Phi
Best place to dive in Thailand for leopard sharks
In the Andaman Sea off Thailand's western coast are the islands of Koh Phi Phi, made famous by the 2000 film "The Beach.” It has long been a magnet for backpackers and adventure-seekers, drawn to its pristine white-sand beaches and crystal-clear turquoise waters. While the main island of Koh Phi Phi Don has developed a reputation as a lively party destination, there are plenty of places to enjoy a quieter experience.
For divers, the real allure lies beneath the waves with an array of captivating dive sites teeming with incredible biodiversity. On the fringing coral reefs, you'll find everything from turtles and barracuda to moray eels and peacock mantis shrimp. If you’re lucky, you may even encounter the graceful silhouettes of leopard sharks gliding through the blue or the majestic bulk of a whale shark. For those seeking a more intimate underwater experience, the reefs also harbour a wealth of macro life.
Whether you're a beginner diver looking to earn your certification or an experienced explorer seeking out more challenging sites, the Phi Phi Islands are a diver’s playground. The above water scenery here is also second to none, with Koh Phi Phi considered one of Thailand’s most beautiful destinations.
An aerial view of an eco-friendly dive resort on Koh Phi Phi
An aerial view of the idyllic beachfront setting at SAii Phi Phi Island Village (photo courtesy of Expedia)
Eco-friendly dive resorts in Koh Phi Phi
Sprawled across 70 acres of lush coconut palm plantations, this eco-friendly Phi Phi resort commands an idyllic stretch of white sand. It’s located amidst the peaceful seclusion of Loh Ba Gao Bay along the island's northeast coast and features traditional Thai-style bungalows and exclusive hillside villas with private plunge pools. The resort's 5-Star PADI dive centre allows you to explore the surrounding reefs while the Marine Discovery Centre is all about educating guests and promoting environmental sustainability.
"Not enough adjectives to describe the beauty of this place.” - Neelofar (read more reviews here)
Best eco-friendly dive resorts in Koh Phi Phi
An aerial view of an eco-friendly dive resort on Koh Phi Phi (photo courtesy of Expedia)
Tucked away on the island of Phi Phi Don, Zeavola stands out as one of the most sustainable dive resorts in Thailand. It has earned prestigious accolades for its commitment to eco-conscious tourism, including Travelife's coveted Gold Certification and the Green Fin label awarded by the Phuket Marine Biological Center. Rather than compromising the luxurious 5-star experience, Zeavola's dedication to sustainability actually enhances the resort's offerings, encouraging guests to indulge in the property's lavish amenities while simultaneously protecting the islands' precious natural treasures.
“Beautiful barefoot luxury resort in lush jungle surroundings with a stunning beach outlook.” - Emma (read more reviews here)
Best places to dive in Thailand
Koh Lipe
Best place to dive in Thailand without crowds
Travel further south on Thailand's west coast and you'll discover the small, idyllic island of Koh Lipe, a true gem for those seeking to escape the crowds and explore less frequented dive sites. This stunning island offers a range of accommodation options to suit every budget, from charming guesthouses to luxurious pool villas offering an eco-friendly barefoot island experience.
Koh Lipe's picturesque beaches are straight out of a postcard and unlike some of Thailand’s more popular dive destinations, its coral reefs are exceptionally well-preserved. The island forms part of Tarutao National Marine Park, home to a wealth of dive sites suitable for divers of all skill levels. Underwater explorers can expect to encounter a kaleidoscope of tropical fish species, as well as the occasional turtle, dolphin and (if you’re exceptionally lucky) even dugongs or sperm whales.
Beyond the incredible marine life, the dive sites around Koh Lipe also feature stunning pinnacles and rock formations that add to the allure of this Thai dive destination. While boat diving from land-based operators is the norm, some liveaboard itineraries also include Koh Lipe, allowing visitors to immerse themselves in the island's underwater wonders on a longer Andaman Sea itinerary.
Best eco-friendly dive resorts on Koh Lipe
Ocean views from one of the rustic bungalows at the Castaway Resort on Koh Lipe (photo courtesy of Expedia)
Eco-friendly hotels on Koh Lipe
Set on the stunning shores of Sunrise Beach, this eco-friendly Koh Lipe beach resort offers guests an unforgettable island getaway steeped in Thai-inspired design. Drawing inspiration from the rich architectural heritage of the region, the resort's charming bungalows have been crafted using natural materials that allow for the free flow of cooling ocean breezes. In addition to providing refillable water containers, Castaway Resort uses energy-efficient appliances and supports local conservation efforts. The attached dive centre offers memorable excursions within Tarutao National Marine Park.
"Amazing location, beautiful resort with style and great vibe.” - Elisabetta (read more reviews here)
Best eco-friendly hotels on Koh Lipe
Open-air dining with a view at Irene Resort on Koh Lipe (photo courtesy of Expedia)
Located on Koh Lipe's northern coastline, the luxurious Irene Resort offers travellers a 5-star island getaway, with an expansive outdoor swimming pool, a state-of-the-art fitness centre and a restaurant serving mouthwatering cuisine. The management at this eco-conscious Koh Lipe resort has long been at the forefront of sustainable practices, evaluating every aspect of the resort's operations to minimise its environmental impact. Aside from offering snorkelling and scuba diving excursions, the Irene features a pampering spa and kayak/paddleboard rentals.
"Irene is one of the most stunning resorts I’ve stayed at.” - Hollie (read more reviews here)
Best places to dive in Thailand
Pattaya
Best place for wreck diving in Thailand
Pattaya may be a popular beach destination for Bangkok residents looking to escape the bustling city, but it's far from a quiet seaside town. This large, vibrant city on the eastern coast of the Gulf of Thailand offers a diverse array of attractions and experiences, from its lively nightlife and entertainment districts to its abundant opportunities for outdoor adventure.
For underwater enthusiasts, one of Pattaya's biggest draws is its abundance of wreck dives, the most famous of which is the HTMS Khram. This decommissioned Royal Thai Navy ship was intentionally sunk in 2011 to create an artificial reef and is now coated in a vibrant array of corals and marine life. Other notable wrecks in the Pattaya area include the HTMS Kut and HTMS Mataphon, each offering their own unique underwater landscapes to explore.
Beyond the wrecks, Pattaya is also home to the "Fingers" of Koh Man Wichai. Here, the coral formations resemble the outstretched digits of a giant hand, providing a unique backdrop for spotting tropical fish. With its combination of man-made and natural underwater marvels, Pattaya has firmly established itself as a premier destination for divers seeking a city-meets-scuba vacation.
Eco-friendly hotels in Pattaya
In the heart of Pattaya Central, the Amethyst Hotel boasts a wealth of premium amenities, from its outdoor swimming pool to the well-equipped fitness centre and gourmet onsite restaurant. Featuring comfortable, air-conditioned rooms, this eco-friendly Pattaya hotel has made sustainability a top priority, implementing energy-saving technologies and recycling programs throughout the property. This green ethos is further evidenced through the hotel's collaboration with CF-Hotels, a platform dedicated to promoting eco-conscious practices within the hospitality industry.
"Fantastic hotel in a great location.” - Peter (read more reviews here)
Best eco-friendly hotels in Pattaya
A contemporary dining space at the Amethyst Hotel Pattaya (photo courtesy of Expedia)
Best time to dive in Thailand
Thailand's diverse coastlines provide scuba divers with incredible opportunities to explore the country's vibrant marine ecosystems year-round. On the eastern side, the waters of the Gulf of Thailand offer exceptional visibility from May through September, making it an ideal destination for divers seeking crystal-clear conditions. The western Andaman Sea, on the other hand, tends to provide the best diving experiences from October through April, as this region generally experiences more favourable weather and sea states during those months. Divers should keep in mind that the Similan Islands and Surin Islands are closed from May to October during the monsoon season.
Plan an eco-friendly dive vacation in Thailand
FAQs about diving in Thailand
When is the diving season in Thailand?
The peak tourist season in Thailand runs from November through April and this the optimal time to explore most of the country's scuba diving destinations. The period from February to April in particular offers the most ideal conditions, both above and below the water, with the seas calm and the visibility usually excellent. Crowds of tourists tend to be smaller as well, allowing divers to enjoy a more intimate experience. This is also the prime season for encountering whale sharks and manta rays, which are more frequently sighted on Thai liveaboard cruises.
Beyond the Similan Islands, the popular diving hubs of Phuket, Krabi, Phi Phi and Khao Lak also shine brightest from November to April, inviting visitors to immerse themselves in the country's breathtaking underwater world. Meanwhile, the Gulf of Thailand's Koh Samui and Koh Tao are best explored from March to September, with the busiest months being July and August when Europeans and North American are on their summer holidays.
Is the scuba diving good in Phuket?
While the diving opportunities around Phuket are okay, with a handful of excellent sites just a short boat ride from the shore, the best scuba diving in Thailand lies further afield. Pattaya is one of the best places to go wreck diving in Thailand while Koh Lipe is ideal for those who want to dive without the crowds.
For the ultimate Thai diving adventure, the real prize lies in venturing even further - typically requiring a multi-day liveaboard cruise to reach the legendary Similan Islands and Surin Islands. Longer liveaboard trips push on into the pristine waters of Myanmar, home to some of the most untouched reefs on the planet. The journey to get there is all part of the allure, as divers get to enjoy the thrill of exploring these remote, largely uninhabited islands and atolls.
How much experience do you need to dive in Thailand?
When it comes to diving in Thailand, the amount of experience required can vary quite a bit, depending on the specific dive area and the type of diving you want to do. For those just starting out, there are plenty of shallow, beginner-friendly dive locations that only require open water certification, with Koh Tao being a great place to take your first steps. The island’s calm, clear waters are perfect for newly-certified divers to get comfortable underwater and build up their confidence and skills.
However, for more advanced divers seeking out underwater caves, wrecks and drift diving opportunities, you might want to consider a Thailand dive vacation to Richelieu Rock, Hin Daeng and Hin Muang. The strong ocean currents found at certain sites mean divers need to be highly skilled at buoyancy control and navigating underwater. For intermediate divers, the sites around the Similan Islands and Koh Phi Phi are ideal, with incredible marine life to discover.
Should I stay at a dive resort or a liveboard in Thailand?
When planning a Thailand dive vacation, you have the choice between resort diving and liveaboard diving. Resort diving offers the convenience of being based at a single location, often a luxurious beachfront resort, and taking day trips out to nearby dive sites. This allows divers to enjoy the creature comforts of the resort between dives, with access to amenities like restaurants, bars and recreational activities. Many of Thailand’s best dive sites can easily be reached from resorts, including those around Koh Phi Phi, Koh Lipe and Koh Tao.
In contrast, liveaboard diving involves spending multiple days and nights aboard a specialised dive boat, travelling to remote dive destinations that are largely inaccessible from shore. The schedule on a liveaboard is more regimented, with multiple dives per day, but this allows for maximum time spent underwater. The downside is that you have less space and few other recreational activities available, meaning it's not ideal if you're travelling with non-diving family or friends. But if you want to reach the Similan Islands or the Surin Islands, then a Thai dive liveaboard is your best option due to the remote setting of these archipelagos.
About the authors
We are a team of passionate divers and surfers with decades of combined experience in the water and travelling to all corners of the globe. After years of chasing waves and descending into the deep blue, we've created this resource highlighting sustainably run surf camps, eco-friendly dive resorts and conservation-focused ocean trips to help inspire your next adventure.
Eco Ocean Escapes was born out of a love of the ocean, an obsession with travel and a concern about the impacts of our adventures on the environments we explore. Despite the benefits that surf and dive tourism can bring to local communities, we recognised that ocean-based adventures are not always managed in a sustainable manner.
Through our articles, we hope to inspire those seeking a responsible surf or dive trip that is all about supporting local communities, preserving our coastal environments and the incredible marine species that inhabit our oceans.