Silfra Fissure Snorkeling From Reykjavik: The Day Trip

• Top choice Silfra fissure snorkeling from US$137 Duration3 - 5.5 hours^[1]Rating4.71 from 2,142 reviews^[1]PickupPickup: check availability for options^[1]GuideLive tour guide in English^[1] Check availability
• Silfra with free photos from US$215 Duration4.5 hours^[5]Rating4.83 from 628 reviews^[5]PickupPickup included: check availability^[5]GuideLive tour guide in English^[5] See this tour
• Golden Circle and Silfra from US$298 Duration10 hours^[6]Rating4.82 from 304 reviews^[6]PickupPickup included: check availability^[6]GuideLive tour guide in English^[6] See this tour

What Is the Silfra Fissure?

Silfra is a narrow crack in the ground at Þingvellir, filled with glacial water so clear that it looks like an aquarium nobody finished stocking. Tectonically it is a meeting point: at Þingvellir the North American and Eurasian plates break apart and the land between them subsides, while away from the plate boundaries the activity is fairly constant at about two centimetres a year, and stress in the rift zones builds up and is released in bursts.^[7] The water you float in starts as glacial meltwater, filtered through porous underground lava for 30-100 years before it reaches the spring that feeds the fissure.^[2]

That long underground journey leaves the water extremely pure, and visibility in Silfra runs over 100 meters.^[2] The fissure reaches depths of up to 200 feet (60 meters) in its deepest sections, though most snorkeling takes place near the surface.^[8] In practice you float rather than swim: face down, arms mostly still, breathing steadily through your snorkel while the guide leads the line through the channel. Rock walls rise on both sides, the bottom drops away in places, and the light bends and shifts as you move.

Getting From Reykjavík to Silfra

Þingvellir National Park sits 47 km northeast of Reykjavík on Route 36, so a Reykjavík to Silfra snorkeling tour is a short drive rather than an expedition, on paved road most of the way.^[9] The tour booked here lists pickup available, with options to check for your date, which saves you the navigation and the parking.^[1] It is a busy place: Þingvellir National Park receives approximately 1.5 million visitors each year, so an early arrival leaves more room around the paths and the changing area.^[10]

The park was added to UNESCO's World Heritage List in 2004, and it is worth walking a little of it either side of your snorkel.^[11] Þingvallavatn, the lake the fissure opens into, covers 84 square kilometres and has a greatest depth of 114 metres, and the view from the paths above the water is one of the quiet highlights of the route.^[12] Bring a windproof layer for the surface time; the open ground beside the lake can feel far colder than Reykjavík, whatever the forecast promises.

Green troll hair, lava walls and deep blue water in the Silfra channel.

The Snorkeling Tour in Detail

The Reykjavík: Silfra Fissure Snorkeling between Two Continents tour starts from US$137, lasts 3 - 5.5 hours depending on the departure, and is led by a live tour guide in English.^[1] Groups are limited to 6 participants, so fitting drysuits, the safety briefing and the walk to the entry point never turn into a queue.^[1] The listing is rated 4.71 from 2,142 reviews, with guide scores of 4.8, transportation 4.5 and value for money 4.4.^[1] A Silfra snorkeling day trip from Reykjavík leaves most of the day free if you choose one of the shorter departures.

Booking is flexible: you can reserve now and pay later, and cancel up to 24 hours in advance for a full refund.^[1] Pickup is available with options to check for your date, and starting times vary, so pick a departure that suits your transport and how early you are willing to get up.^[1] If you want photos included or a longer day out, other listings combine Silfra with the Golden Circle or add photo packages, while this one keeps the focus on the fissure itself.

Snorkeling or Diving at Silfra?

Snorkeling needs no certification. Diving does: to scuba dive at Silfra you are required to have either a drysuit diver certification or drysuit dive experience.^[4] Divers join separate departures with their own gear checks, and there the group size and depth profile are different. If you hold the certification and want the deeper route, dive trips run from Reykjavík with small groups, longer days and pickup options to check for your date.

On a snorkel tour you stay near the surface and look down into the crack. That is where the colour lives: pale turquoise over the sandy shallows, then deep blue as the walls fall away, with green rock and fallen boulders below you. Snorkelers see the same walls, the same light and the same narrow passage as divers, just from a different height in the water column, and the float is gentle enough that strong swimmers and nervous first-timers tend to end up in the same cheerful mood.

Who Can Join a Silfra Snorkeling Tour?

There are firm requirements. To snorkel at Silfra, participants must be at least 12 years old and at least 150 cm tall, and must be able to swim and be comfortable in water; life jackets and swimming aids are not permitted.^[3] In other words, non-swimmers cannot join and a floatation aid is not an acceptable substitute. If you can swim a length comfortably and you are happy putting your face into cold water, you will be fine.

Expect the gear to feel odd at first. A drysuit is stiff, the hood is tight, and the walk from the changing area to the entry steps is short but clumsy. Guides deal with this every day and will check your seals, gloves and mask before you get in. Tell them about asthma, heart conditions, claustrophobia or anything else relevant, and speak up early if a seal pinches. If anyone in your group is close to the minimums, ask about the requirements before you book.

What You See Underwater in the Fissure

The colours are the surprise. Marine life in Silfra consists mostly of bright green "troll hair" and different types of algae, which coat the rock in vivid green.^[2] Above that, the water shifts from pale turquoise over white sand to deep blue where the crack drops away, and on a bright day sunlight throws moving patterns across the lava walls. Fish are not the point here; the clarity, the colour and the rock formations are.

Most of the route stays shallow, and with visibility of over 100 meters you can often see far down the channel from where you start.^[2][8] Depth below you varies a lot, and the fissure reaches depths of up to 200 feet (60 meters) in its deepest sections, which is a long way down when you are floating on the surface looking into it.^[8] Keep your hands still, fin gently and stay behind the guide: the fissure is fragile, and the park rules that protect it above water apply below it too.

When to Go and How to Book

Silfra runs all year. The glacial meltwater stays 2°C to 4°C year round and never freezes, because fresh water constantly fills the fissure.^[2] Summer brings long daylight and warmer air; winter brings snow on the surrounding lava, low golden light and quieter paths. Staying dry inside the suit is what keeps you warm. The thermal layer under the drysuit matters more than the forecast above. Underneath the suit you want wool or fleece, warm socks and nothing cotton.

Build your day around the tour rather than the other way round. Check starting times for your date, work out whether pickup suits you better than driving, and leave a buffer for road conditions; the park is 47 km northeast of Reykjavík on Route 36.^[9] Reserve now and pay later is available, and free cancellation up to 24 hours in advance means you can hold a slot early and release it if plans move.^[1] The snorkel fills part of a day, leaving time for the national park paths, the lake overlook or a slow drive back to Reykjavík.

Your Silfra snorkel day

1. Book your departure

   Pick a date and starting time that suits your trip, and decide whether you want pickup.

2. Travel to Þingvellir

   The park is 47 km northeast of Reykjavík on Route 36, an easy drive or a pickup ride.^[9]

3. Get kitted out

   Guides fit your drysuit, hood, gloves and mask, then brief the group before the walk to the entry point.

4. Float the fissure

   You lie face down and drift through the channel between continents while the guide leads the line.

5. Warm up and look around

   Back at the changing area you strip off the suit, get into dry layers and walk a little of the national park.

Good to know first