The Silfra fissure is a deep crack in the Earth's crust, a divergent tectonic boundary between the North American and Eurasian plates. The two plates are slowly pulling apart, creating a gap that is filled with crystal clear water from nearby glaciers.
The water in the Silfra fissure is some of the clearest and purest in the world, with visibility that can reach up to 100 meters. It is also very cold, with temperatures ranging between 2°C and 4°C throughout the year. Due to its unique characteristics, the Silfra fissure is a popular destination for scuba diving and snorkeling.
Diving or snorkeling in the Silfra fissure is a unique experience, as it offers the opportunity to swim between two continents in crystal clear water. The water is so clear that it almost looks like you are swimming in air, and the colors of the underwater landscape are breathtaking. However, diving or snorkeling in the Silfra fissure requires special equipment and training, as the water is very cold and the currents can be strong.