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Photo Modified: Flickr /  cisc1970/ CC BY 4.0

There are several active volcanoes in Dominica, which affect the reef. Underwater geothermal springs vent gasses in the form of thousands of warm bubbles giving snorkelers a feeling of swimming through a giant glass of Champagne, according to ChampagneReef.com. You can expect to see a myriad of sea life including sponges, lobster, parrot fish, and a resident population of Hawksbill turtles.