Silfra fissure, located in the heart of Thingvellir National Park, is one of the world's truly rare and spectacular geological wonders. Thingvellir is a place of incredible natural and historical significance; a landscape of giant lakes, sprawling glaciers, ancient lava fields and Iceland's only UNESCO World Heritage Site as it was the founding site of the world's oldest existing parliament (Althingi, 930 AD). Silfra itself is a direct product of two great continental landmasses pulling apart, the same forces of creation that gave birth to Iceland.
The chasm is a terrestrial feature created by the rift between the North American and Eurasian tectonic plates. The crystal clear waters that flow through it are the result of an incredible natural slow filtration process. Here, the meltwater from the Langjökull glacier is constantly percolating through the porous lava fields of the surrounding landscape, a process that can take a single drop of water up to a century to go through and reach the fissure. The result is pure glacial water with virtually limitless visibility, all combining to make for one of the world's truly unique and spectacular freshwater snorkeling and diving sites!