Richelieu Rock

Richelieu Rock Diving Guide

Richelieu Rock, located north of the Similan Islands, is arguably Thailand's most famous dive site. A submerged pinnacle teeming with vibrant marine life, it's a must-do for any serious diver visiting the region. Its isolated location guarantees unforgettable encounters.

Dive Details

Typical Depth Range

The top of the rock starts around the surface, descending to depths of 35 meters (115 feet) or more. Most of the action happens between 5 and 25 meters (16 and 82 feet).

Average Visibility

Visibility varies throughout the year, generally ranging from 15 to 30 meters (50 to 100 feet). Conditions can be affected by plankton blooms.

Water Temperature (Seasonal)

Water temperature stays consistently warm, typically between 27°C and 30°C (81°F and 86°F) year-round.

Difficulty Level

Richelieu Rock is generally considered an intermediate to advanced dive site. Currents can be strong and unpredictable. Good buoyancy control and experience with drift diving are recommended. Novice divers should dive with experienced guides.

Marine Life

Richelieu Rock is a biodiversity hotspot. Divers can expect to see:

• Whale sharks (most common from February to April)
• Mantas rays
• Barracuda schools
• Tuna
• Giant trevally
• Harlequin shrimp
• Seahorses
• Frogfish
• Ghost pipefish
• Nudibranchs of every color
• Soft corals and anemones in abundance

Best Time to Visit

The diving season at Richelieu Rock runs from approximately November to May. The best time to visit is generally from February to April, when the chance of encountering whale sharks is highest. The weather is typically calmer during this period as well.

What Makes It Special

Richelieu Rock's isolation and unique topography create a haven for marine life. The rock itself is covered in a kaleidoscope of soft corals, anemones, and sponges, providing a stunning backdrop for encounters with large pelagics and macro critters alike. The sheer density and variety of marine life are unparalleled in Thailand.

Practical Tips

Consider these points before diving:

• Book your trip well in advance, especially during peak season.
• Choose a reputable dive operator with experienced guides familiar with the site.
• Be prepared for currents. A reef hook can be useful in some areas.
• Pay attention to your buoyancy. Avoid touching the corals.
• Bring a camera – you won't want to miss capturing the incredible marine life.
• Check the weather conditions before your dive.