Silfra snorkeling offers a truly unique experience – it’s the only place on Earth where you can swim between two continental plates. Located just 45 km (28 miles) from Reykjavík in Þingvellir National Park, a UNESCO World Heritage Site, Silfra provides an unforgettable glimpse into Iceland’s dramatic geology.
A typical tour lasts 2–3 hours, including a 30–40 minute snorkel through the fissure’s crystal-clear water. With visibility up to 100 meters (328 feet), you can see every rock formation below, from shallow ledges to the 18-meter-deep Silfra Cathedral. The water temperature stays between 2–4°C (35–39°F) year-round, fed by glacial meltwater that has been naturally filtered through volcanic rock for decades.
All gear is included — dry suit, mask, snorkel, fins, and undergarments — and professional guides ensure a safe, enjoyable experience. Group sizes are small (typically 6–8 snorkelers per guide), so you’ll have plenty of space and personal guidance throughout the dive.
Silfra snorkeling is available year-round, and no diving certification is required. Anyone 12 years and older can join, making it an accessible and extraordinary way to experience some of the clearest, purest water on the planet.
Quick Facts About Snorkeling At Silfra Fissure
Water temperature
2–4°C (35–39°F) year-round.
Underwater visibility
100 meters (328 ft). you can clearly see the bottom even at 18 meters (60 feet) due to near-perfect clarity.
Depth range
2–18 meters
(6–60 ft). 100 meters (328 ft). Visibility makes the fissure look much deeper than it actually feels while floating.
Deepest point
Silfra Cathedral – ~18 meters (60 feet).
Width of fissure
As narrow as 1 meter (3 feet) in some passages, opening up to 8 meters (26 feet) in others.
Gear provided
Drysuit, fins, mask, snorkel.
Group Size
6–8 snorkelers per guide for safety and comfort.
Certification required
None for snorkeling (only for diving)
Requirements for Snorkeling at Silfra
There are certain requirements that you have to take into consideration when planning your Silfra snorkeling tour.
Age
12+ years
Under 18 parent/guardian
Height
150–200 cm
4’11”–6’7”
Weight
45–120 kg
99–264 lbs
When to Go Snorkeling in Silfra
Silfra can be snorkeled year-round, but each season offers a unique experience:
Winter (Nov–Mar):
Crystal ice landscapes, fewer crowds, and the chance to combine snorkeling with the Northern Lights.
Spring (Apr–May):
Long daylight hours and stable conditions.
Summer (Jun–Aug):
Warmest air temperatures, busiest tourist season, but extended midnight sun swims.
Autumn (Sep–Oct):
Stunning fall colors in Thingvellir and fewer crowds.
Prices
Standard Silfra snorkeling tours: ISK 17,000–20,000 (~$120–150 USD).
Combo tours (e.g., snorkeling + Golden Circle): ISK 25,000–30,000 (~$180–230 USD).
Is it safe to snorkel and dive in Silfra Fissure?
Yes, snorkeling and diving in Silfra Fissure are considered safe, provided participants follow the established rules and join with licensed tour operators. Although the environment is extreme — with near-freezing water and unique geological conditions — strict safety measures are in place to protect both visitors and the site
Despite its dramatic setting and icy waters, it’s a well-managed and closely regulated dive site that prioritizes safety above all else.
If you have concerns, your guide will adjust the pace to match your comfort level.
Certified guides
All diving and snorkeling tours are led by certified, experienced dive guides trained in cold-water diving, rescue techniques, and local conditions.
Guides accompany groups from start to finish and monitor each guest closely throughout the tour.
Safety briefings
Dry suit orientation and safety briefings are mandatory.
Emergency protocols are in place, including backup gear, rescue lines, and on-site communication.
Equipment inspection
All equipment is sanitized and thoroughly inspected before each use. Tour operators take hygiene, fit, and function seriously.
Before entering the water, you’ll be shown exactly how to use your equipment, what to expect during the dive, and how to stay warm and comfortable.
Water temperature
The water may be cold (~2–4°C year-round), but it’s clean, calm, and remarkably stable — there are no dangerous currents or wildlife hazards.
Personal attention
Small group sizes ensure personal attention, allowing guides to quickly assist anyone who feels cold or unsure in the water.
How to get there
Silfra is in Thingvellir National Park, about 50 km (30 miles) or 45 minutes from Reykjavik.
Pick-ups
Most Silfra snorkeling tour companies offer pickup in Reykjavik, Iceland’s capital, because that’s where the majority of travelers stay.