Richelieu Rock, Surin Islands, Thailand

Richelieu Rock is a world-famous dive site in the Andaman Sea about 200 kilometers northwest of Phuket, Thailand. The horseshoe-shaped reef is popular for its purple corals as well as diverse marine life, ranging from small fish to large pelagics like manta rays, barracudas, and groupers. Dubbed a "whale magnet" by locals, the spot is also known for its population of whale sharks. There is nothing as exhilarating as swimming in such a wonderland with whale sharks as company.

Location: 14 kilometers east of the Mu Koh Surin marine park

Depth: 10-25 meters

Visibility: Up to 30 meters