Dive through Iceland’s tectonic rift at Silfra

Silfra is a freshwater fissure within the active tectonic rift zone of Þingvellir National Park. Its submerged walls cut through lava formed approximately 10,000 years ago, while groundwater filtered through the surrounding volcanic rock produces exceptionally clear conditions. Silfra lies within the wider rift zone between the North American Plate and the Hreppar microplate, rather than along a narrow line directly separating the North American and Eurasian plates. The site documents Iceland’s volcanic geology from beneath the surface. Þingvellir is also a UNESCO World Heritage Site, inscribed for its cultural importance as the historic setting of the Alþingi, established around 930.

Fun Fact: Groundwater travels through the lava fields from Langjökull glacier for approximately 30 years before reaching Silfra, creating underwater visibility of about 328 feet (100 meters) under favorable conditions.