Richelieu Rock, hailed as Thailand’s ‘best’ dive site, is a hidden underwater gem located in the Andaman Sea. Found 18 km east of the Surin Islands and 100 km north of the Similan Islands, it is part of the Surin National Marine Park. This remote pinnacle is renowned for its biodiversity and beautiful underwater landscapes, making it a must-visit destination for divers from around the globe.
The Unique Geography of Richelieu Rock
Richelieu Rock is a large, horseshoe-shaped pinnacle that peaks just above the waterline at low tide but remains submerged during high tide. Below the surface, it forms a complex maze of overhangs, small caves, and steep slopes. The north and west sides descend dramatically to depths of 35 meters, while the south side offers a gentler slope. The varied topography provides shelter from strong currents, allowing divers of different skill levels to enjoy the site. In addition, the diverse marine life here is another key attraction for visitors.
Marine Life: A Haven for Big and Small Creatures
Richelieu Rock is famous for its incredible range of marine species. From the smallest critters to giant ocean dwellers, there’s something for everyone. Moreover, this dive site is a haven for photographers, especially those passionate about macro photography. Tiny species such as seahorses, harlequin shrimps, and frogfish thrive among the crevices in the limestone rock. One of the rarest sightings here is the tomato clownfish, which finds refuge in the vibrant anemones.
For those seeking encounters with larger marine animals, Richelieu Rock does not disappoint. The site is well known for its pelagic visitors, including trevally, barracuda, and large schools of snappers and fusiliers. However, the main attraction is the whale shark. These gentle giants, which grow up to 16 meters, visit the site regularly between February and April. Many divers plan their trips during this period for the best chance of seeing them.
Diving Experience and Safety Tips
Diving at Richelieu Rock can offer challenges suited to more experienced divers. Although open-water divers can explore the site, advanced certification is a recommendation to be able to maximise your experience. Additionally, divers are advised to have completed at least eight dives, with their most recent dive within the last eight months to ensure safety in these demanding conditions.
Trips to Richelieu Rock are available as day trips or liveaboard experiences. Day trips usually depart from Khao Lak, taking about 1.5 hours by speedboat. Meanwhile, many divers opt for liveaboards, which provide multi-day dive experiences and the opportunity to explore the full range of marine life and geological features over several days.
Jacques Cousteau and the controversial Legend of Richelieu Rock
Most people believe that Jacques Cousteau, the renowned marine explorer, discovered Richelieu Rock. Reportedly, naming it after Cardinal Richelieu. The purple soft corals covering much of the rock supposedly reminded Cousteau of the cardinal’s ceremonial robes, leading to the name we know today.
Although a great tale, the real story behind how Richelieu Rock came to be known, is yet grander still…
Richelieu Rock is truly steeped in Thai maritime maritime history. The rock is actually named after Admiral Richelieu, a Danish naval officer who played a significant role in the naval history of Thailand during the 19th century. While he wasn’t Thai, his contributions to the Thai navy were substantial, leading to the adoption of the name Richelieu Rock as a tribute to his influence.
Best Time to Dive at Richelieu Rock
The best time to dive at Richelieu Rock is from mid-October to mid-May, with the prime months being February to April. During this period, conditions are ideal, with high visibility and calm waters, increasing the likelihood of spotting whale sharks. In contrast, the marine park closes between June and September to protect the ecosystem during monsoon season.
Day Trips vs. Liveaboard Diving Adventures
Divers can choose between quick day trips and longer, immersive liveaboard experiences. Day trips usually offer two dives at Richelieu Rock but can be more costly per dive due to travel time. Alternatively, liveaboard diving offers a more comprehensive experience, often including multiple dives at Richelieu Rock, Koh Bon, and Koh Tachai. Liveaboards are ideal for divers seeking to truly immerse themselves in the Andaman Sea, along with the added comfort of onboard accommodations.
Conservation and Responsible Diving Practices
Richelieu Rock lies within the Mu Koh Surin Marine National Park, making conservation efforts essential. Therefore, divers should practice responsible diving techniques. Maintaining good buoyancy control, using reef-safe sunscreen, and avoiding any contact with marine life are just some of the ways divers can help preserve this marine sanctuary.
In Summary
Richelieu Rock offers a unique and thrilling diving experience for those fortunate enough to explore its waters. Its dramatic underwater topography, vibrant coral gardens, and the opportunity to encounter marine giants like whale sharks make it Thailand’s premier dive site. Whether you’re a seasoned diver looking for adventure, or a nature enthusiast hoping to spot a whale shark, Richelieu Rock promises an unforgettable underwater journey.
