Arctic Adventures Silfra Fissure

About Arctic Adventures Silfra Fissure

The Silfra fissure is a flooded crack in Þingvellir National Park, about 45 minutes' drive from Reykjavík, in the rift between the North American and Eurasian plates. Its glacial water is so clear that snorkelers can often see the far walls of the fissure from the surface.

The water starts as meltwater from the Langjökull ice cap, then filters for decades through porous lava about 50 kilometers underground before it seeps into the fissure. It holds at 2–4°C all year. Snorkelers drift through the narrow Big Crack, over the boulders of Silfra Hall and past the deep blue Silfra Cathedral before finishing in the shallow lagoon.

Silfra snorkeling in Iceland needs no experience, but you can't just jump in. Park rules require full cold-water protection (a dry suit, or a thick wetsuit for snorkelers, plus hood, gloves and neoprene boots), and nobody enters alone. Most people go with a guided operator, who handles the gear, briefing and permit, and operators typically set a minimum age of 12 along with height and weight limits.

Silfra fissure diving is stricter. Divers need an Open Water certificate and a dry suit certificate, or written proof of 10 logged dry suit dives in the past two years. The maximum depth is 18 meters, and caves or overhead areas are off-limits.

The fissure is beside the P5 (Valhöll) parking lot near Þingvellir Church. Parking for a car with up to five seats costs 1,000 ISK for the day, payable at the machines or online. Tours usually include the national park's Silfra fee but not parking.

Trips run year-round because the water temperature barely changes. Snorkelers usually spend 30 to 40 minutes in the water, and the whole visit takes roughly two and a half to four hours. Winter air is the real challenge, so bring thermal layers and wool socks, and afterward walk over to Peningagjá and the Almannagjá gorge.