Silfra is an amazing diving spot located in Thingvellir National Park. It is the crevice between the tectonic plates in North America and Eurasian continents. It is the only place in the world where you can dive between two tectonic plates that shift roughly 2 cm every year. The shifting of the earth creates new caverns and tunnels. There is plenty of wildlife to see on your dive/snorkel. The three main dive sites are; Silfra Hall, Silfra Cathedral, and Silfra Lagoon. The maximum depth is about 207 feet. The water is the purest in the world, and you can feel free to take a sip while diving.