Silfra is the fissure in Thingvellir where you can snorkel between the North American and Eurasian tectonic plates, in glacial water that sits at 2 to 4 degrees Celsius all year with visibility up to 100 metres. It is a guided-only activity with a minimum age of 12, and you float in a drysuit, so no diving experience is needed. This guide covers the water, the gear, who can join, what a tour includes, and how to plan it.
Silfra Snorkeling at a Glance
Short on time? Here is the quick version.
| Silfra snorkeling | |
|---|---|
| Where | Thingvellir National Park, Golden Circle, about 45 minutes from Reykjavik |
| Water temperature | 2 to 4 degrees Celsius, all year |
| Visibility | Up to about 100 metres |
| Gear | Drysuit over thermals; no diving certificate needed |
| Minimum age | 12 (under 18 with an adult) |
| Time in water | About 30 to 40 minutes |
| Access | Guided tours only |
What Silfra Is and Where It Sits
Silfra is a water-filled rift in Thingvellir National Park, part of the Golden Circle and about 45 minutes from Reykjavik. It runs along the boundary between the North American and Eurasian tectonic plates, which is why the pitch is that you swim between two continents. The roughly 200-metre fissure is fed by glacial meltwater from Langjokull that has been filtered through porous lava rock for decades, which is what gives the water its clarity.
What the Water Is Like: Temperature and Visibility
Two numbers define the experience. The water holds at 2 to 4 degrees Celsius all year, because it is glacial melt rather than sea water, so winter and summer feel much the same once you are in. Visibility reaches up to about 100 metres, among the clearest fresh water anywhere, so even though the water is cold the view is the reason people come.
Drysuit, and Why You Do Not Need to Dive
Snorkeling Silfra is done in a drysuit worn over warm undergarments, which keeps you dry and insulated while you float at the surface. Snorkeling needs no diving certification, so it is open to anyone who meets the age and fitness rules below. Diving Silfra is also possible but requires a separate drysuit diving certification, so most visitors snorkel.
Who Can Snorkel Silfra: Age, Fit, and Health
Operators apply a few consistent limits, so check them before booking. The minimum age is usually 12, and anyone under 18 joins with an adult. You must be comfortable swimming unassisted. Because the drysuit has to seal properly, there is a fit range of roughly 150 to 200 cm in height and 45 to 120 kg. Operators also ask you to declare relevant medical conditions, since this is cold water.
What a Tour Includes and How Long It Takes
You are in the water for about 30 to 40 minutes, and the whole on-site experience runs about two and a half hours once you add the safety briefing and getting in and out of the drysuit. A Silfra snorkeling tour typically includes your guide, snorkeling gear, and the drysuit with undergarments, and many operators throw in underwater photos. Tours run year-round.
Practical Tips: Booking and What to Wear
A few things make the day easier:
- Wear warm, thin base layers you can move in, since you add these under the drysuit. Bring a hat and gloves for before and after.
- Book ahead in summer, when Golden Circle tours fill up, and allow extra time if you add hotel pickup rather than meeting at Thingvellir.
- Only your face and hands meet the water, so the cold is very manageable for the short time you are in.
- To line up a Silfra tour, or pair it with the rest of the route, compare guided Golden Circle and Silfra tours before you book.
Check the timing
The Driving Distance Calculator helps turn a visit to Silfra Snorkeling in Iceland: What to Know Before You Go into a realistic self-drive day.
