The marine park protects a huge diversity of marine life including 700 reef fish species, sharks, turtles, rays, lobster, conch, and crabs. It also falls on an important migratory route for whales and dolphins. Marine animals you can expect to spot diving St Maarten include: Caribbean reef shark.

The waters around St. Maarten/St. Martin are teeming with over 700 species of fish and a vibrant array of Caribbean marine life. Snorkelers and divers frequently encounter Green and Hawksbill Turtles, Spotted Eagle Rays, and playful Octopus among the shallow coral reefs. For those visiting between February and June 2026, there is a high probability of spotting migrating Humpback Whales in the open water. One of the island's most unique attractions is the "Underwater Sculpture Park" in Little Bay, which serves as an artificial reef and habitat for diverse aquatic species. At "Big Mama’s Reef," you can often see a healthy population of Caribbean Reef Sharks, while areas like "Charlie’s Shoal" are known for Barracudas, Stingrays, and large Grouper. The marine environment is protected by several reserves, ensuring that the hard and soft corals remain a healthy home for the colorful reef fish that make St. Maarten a premier snorkeling destination.