4 Thingvellir National Park Iceland shutterstock445242850.jpg

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Snorkeling in Iceland, where some of the clearest water on the planet is, is definitely on the bucket list of adventurers. It’s going to be cold and you’ll need a drysuit but the water is turquoise clear, so clear that visibility is virtually unlimited. You’ll bobble above magnificent rock formations and explore sea grasses so green they seem surreal. Snorkeling in the Silfra fissure is literally snorkeling between the North American and Eurasian continents.