Richelieu Rock

Richelieu Rock (called Hin Plo Naam in Thai) is a dive site in Thailand in the Andaman Sea about 45 kilometres (28 mi) from the mainland.

The horseshoe-shaped reef is known for its purple corals as well as diverse marine life ranging from small fish and harlequin shrimp to large pelagics like whale shark and manta ray.

Partly due to its unique geology as a solitary pinnacle standing out from around 30 to 35 m (98 to 115 ft) depth to just under the surface at high tide it attracts a variety of different pelagic species of all different sizes.

Reports claim regular appearance of Malabar groupers, bigeye snappers, Bannerfish, lionfish, triggerfishes and shovelnose rays.

[4][2] Richelieu Rock is part of the Mu Ko Surin National Park, which is open 15 October to 15 May and may close earlier depending on weather conditions.