Astari 
Silfra is a rift valley, signifying the gap resulting from tectonic plates pulling apart between the North American and Eurasian plates.
As the plates drift along the Mid-Atlantic Ridge, Silfra integrates into this geological phenomenon.
Furthermore, the fissure, a crack where most activities occur, spans approximately 656 feet.
This length represents the visible part of the fissure, the most famous and frequently explored section of Silfra.
Similarly, the pristine waters emerge from Iceland’s second-largest glacier, traveling through underground lava fields and undergoing natural filtration.
Moreover, this rift is located in Thingvellir National Park, 25 miles northeast of Reykjavik, the capital of Iceland.
The depths, remarkable clarity of the water, and visibility offer an unparalleled glimpse into the Earth’s dynamic forces present in Silfra.
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Geological Forces Shaping Silfra’s Landscape
After tectonic drift, the plates move approximately 0.79 inches farther apart each year, creating tension.
Subsequently, significant earthquakes every ten years lead to cracks and fissures in Thingvellir valley.
Positioned at the edge of Thingvallavat Lake, Silfra is one of the largest and deepest fissures.
It intersects a major aquifer, supplying numerous springs. Falling boulders and rocks have widened the cracks, forming caves within the fissures.
The Clearest Water in the World
What sets this location apart from other dive sites is its incredibly clear water.
Originating from Langjökull, Iceland’s second-largest glacier, the water travels through underground lava fields for decades before emerging.
During this journey, the water undergoes natural filtration, removing impurities and sediments.
As a result, this rift’s visibility reaches 100 m, making it one of Earth’s clearest bodies of water.
Main Dive Sites in Silfra
Silfra is divided into three unique sections, each providing a distinct underwater experience.
The Silfra Hall is known for its wide and deep section, reaching a maximum depth of about 45 m.
The Silfra Cathedral earns its name from towering underwater cliffs spanning 330 feet.
Finally, the Silfra Lagoon, as the concluding section, offers a shallower and more relaxed environment, with depths ranging from 23 to 46 feet.
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Diving and Snorkeling
Silfra has gained international acclaim as a premier destination for both scuba diving and snorkeling.
Additionally, divers and snorkelers can explore the underwater wonders, navigating through mesmerizing rock formations. They witness incredible visibility, creating a unique and surreal experience.
Furthermore, divers can comfortably explore the water, which maintains a temperature ranging from 2 to 4°C, by wearing a dry suit.