Located in the Þingvallavatn Lake in the Þingvellir National Park in Iceland, Silfra is a rift that is part of the divergent tectonic boundary between the North American and Eurasian plates.
Silfra, by virtue of its location in the Þingvallavatn, contains clear, cold water that attracts scuba divers drawn to its high visibility and geological importance; divers are literally swimming between continents. The rift claims a shallow depth nearest to the bank, but deepens and widens further out.
The rift offers amazing visibility and has been placed on the top 3 diving destinations list by multiple publications. The visibility reaches end-of-sight and is rated at 150 to 300 meters. The water is 50 to 100 years old once it reaches the lake from the melting glacier through the lava field, and is drinkable.[1][2][3][4]