Immerse yourself in the clearest water in the world and float between two continents in the famous Silfra Fissure, a truly unforgettable experience. Silfra is a fissure created by the separation of the North American and Eurasian tectonic plates cutting through Iceland. The snorkeling area is just about 30 miles northeast of Reykjavik on the shores of Lake Thingvallavatn.

The fissure fills with glacial water that's been filtered underground for decades via hardened, porous lava rock. The filtering process of the glacial water makes Silfra one of the clearest bodies of water on earth, with up to 400 feet (120 m) of visibility.

During your snorkel, you'll explore the four main parts of Silfra: Big Crack, Silfra Hall, Silfra Cathedral, and Silfra Lagoon. Start by floating through Big Crack, Silfra's narrowest section, where the continental plates are so close, and you can almost touch them. The fissure then widens into Silfra Hall, where the full spectrum of the fissure's colors and clarity become all the more apparent. Looking at just the right angle, you can see Lake Thingvallavatn, nearly 100 miles (150 m) away.

Near to the opening to Lake Thingvallavatn is the Silfra Cathedral. The depth is about 75 feet (23 m), so enjoy floating over boulders and glacial silt. Complete your snorkeling adventure in the Silfra Lagoon with seemingly endless visibility!

Discover more unique experiences in the Golden Circle and other active excursions in Iceland.