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Richelieu rock Richelieu Rock, one of the best places in the world to dive with whale sharks and is easily the best dive site in Thailand for this amazing activity. Encounters with whale sharks, the largest fish in the ocean are rare, almost anywhere in the world. This is not the only diving destination in Thailand, where whale sharks are seen, but Richelieu Rock certainly attracts more than its fair share. With nothing else for miles around, the whale sharks are attracted to the rock to feed (THAILAND-DIVING1, Mar 2019)