Silfra Fissure

Diving The World's Clearest Water

The Silfra Ravine, located in the UNESCO World Heritage Site of Thingvellir National Park, about one hour’s drive east from Reykjavik, is one of the world’s most spectacular dive sites. The ravine was formed as part of the Mid-Atlantic Ridge, which runs diagonally through the middle of Iceland and represents the divide between the diverging North American and Eurasian tectonic plates.

Divers enter via a steel access ladder into the water, then exit on the far side using another ladder. The site is approximately 42m deep in places. There’s a long canyon with vertical rock walls on both side, about 350m long.The site is divided up into four sections; the Big Crack, the Hall, the Cathedral and the Lagoon.

Small dwarf Arctic Char live inside the crack, using it as a nursery ground, before heading off into the lake. The water is 2°C – 4°C year round. It is extremely clear and fresh, sourced from the Langjökull glacier. It takes over a decade to reach the site, moving slowly underground through porous lava rock. Underwater visibility is tremendous reaching over 100m.

The site is available to dive all year round, especially during wintertime because it does not freeze. it is regarded as a challenging dive and is recommended that divers practice using a drysuit beforehand. Expect a dazzling experience of colour and light with pristine conditions for underwater photography.

The world’s clearest water is waiting for you on the Silfra Diving Day Trip & the 3-Day Tectonic Dive Expedition


  • World's clearest water
  • Available all year round
  • Challenging dive