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Explore Silfra, a freshwater fissure in Thingvellir National Park known for its exceptionally clear water. It lies within the rift valley between the North American and Eurasian tectonic plates, where snorkeling and diving reveal submerged lava formations.

Layered rock walls, freshwater algae, and deep blue views give Silfra a different character from Iceland’s landscapes above ground. Its location on the Golden Circle also lets visitors combine an underwater experience with Thingvellir National Park’s walking paths and historic sights.

Several snorkeling tours and diving tours visit the fissure year-round. Silfra snorkeling ranks among the three highest-scoring activities in our ranking of Iceland’s best-reviewed tours.

To add local insight, we spoke to Grétar Þorláksson, an experienced Silfra snorkeling guide from Adventure Vikings. He explains the underwater landscape, what visitors can expect, and why the fissure still impresses him after thousands of visits.

Key Facts About Silfra

• Location: Thingvellir National Park in Southwest Iceland, near the northern shore of Lake Thingvallavatn.

• Distance from Reykjavik: About 37 miles (60 kilometers), or approximately an hour’s drive in good conditions.

• Visibility: Approximately 328 feet (100 meters) in clear conditions.

• Water temperature: Around 35 to 39 F (2 to 4 C) throughout the year.

• Depth: Parts of the fissure reach about 197 feet (60 meters), but the permitted diving depth is limited to 59 feet (18 meters).

• Water source: Glacial meltwater that filters underground through volcanic rock for decades.

• Activities: Surface snorkeling and scuba diving for visitors who meet the participation requirements.

• Access: Self-drive via Route 36 or join a tour with transportation from Reykjavik.

What is Silfra?

Silfra is a water-filled crack in the lava rock of Thingvellir National Park. Its name refers to silver, reflecting the clarity of its water. Fresh spring water flows through the fissure toward Lake Thingvallavatn.

Contrary to a common misconception, Silfra’s walls are not the edges of the North American and Eurasian tectonic plates. Grétar explains that the fissure lies within the wider rift valley, so visitors are between the plates but cannot touch both continents at once.

The fissure predates the earthquakes of 1789, which are often associated with its formation. Its exact age is uncertain, but geological and historical evidence indicates that it has existed for more than a millennium.

Silfra continues to change as the surrounding rift zone moves. The national park estimates that the fissure widens by about 0.04 to 0.2 inches (1 to 5 millimeters) annually.

How To Get to Silfra From Reykjavik?

Silfra is inside Thingvellir National Park in Southwest Iceland, northeast of Reykjavik. Follow Route 36, also called Thingvallavegur, toward the park for about 37 miles (60 kilometers), or around an hour’s drive in good conditions.

Within the park, continue toward P5 near Thingvallakirkja Church. Silfra lies near the northern shore of Lake Thingvallavatn, a short walk from the parking area.

Rental cars let you combine Silfra with a Golden Circle drive or longer self-drive trips. Thingvellir is one of the three main stops on Golden Circle tours, alongside Geysir Geothermal Area and Gullfoss Waterfall.

The route is used year-round, but winter snow, ice, and storms can affect access and journey times. Check road conditions and the weather forecast before setting out, and allow extra time for winter driving and the walk from the car park.

There is no regular public bus service to Thingvellir. Travelers without a car can book a Silfra snorkeling tour with a transfer from Reykjavik.

Parking and Meeting Your Guide at Silfra

Visitors arriving by car to Silfra should park at P5, also called Valholl, near Thingvellir Church. The smaller parking area beside Silfra is reserved for commercial vehicles. The tour meeting area is about a five-minute walk from P5. Check your booking confirmation for the exact meeting point and arrival time.

Parking costs about 1,000 ISK for a car with five or fewer seats and 1,200 ISK for a vehicle with six to nine seats. Your payment is also valid that day at P1, P2, and P5, three other designated parking areas within Thingvellir National Park.

Payment machines are available at the designated parking areas. You can also pay online through Checkit.

Why Is Silfra Famous?

Silfra is best known for its exceptionally clear water and deep blue underwater views. Its layered lava walls and freshwater algae create a landscape that is difficult to appreciate from above the surface.

The fissure’s water originates from Langjokull Glacier and travels underground through porous lava for decades. This natural filtration produces visibility of approximately 328 feet (100 meters) in clear conditions.

Grétar emphasizes that visitors come for the underwater landscape rather than abundant wildlife. Fish sightings are uncommon within the fissure, even though nearby Lake Thingvallavatn supports several fish species.

The Four Sections of Silfra

The main visitor route through Silfra is commonly described as four sections. Each has a different shape, ranging from narrow passages between rock walls to a broad, shallow lagoon.

• Silfra Big Crack: The first section after the entry platform has closely spaced rock walls. It introduces visitors to the fissure’s depth and clear underwater views.

• Silfra Hall: The passage opens into a wider section with lava formations on either side. Light filtering through the water highlights the shapes and colors of the rocks.

• Silfra Cathedral: This long, deep section is known for its blue views and towering underwater walls. Visitors remain within the permitted route rather than entering caves or enclosed passages.

• Silfra Lagoon: The route opens into a shallow lagoon with patches of freshwater algae. It provides a different view from the narrower sections and leads toward the exit platform.

Snorkeling and Diving in Silfra

Snorkeling provides a view of Silfra from the surface, while scuba diving takes qualified visitors beneath the water. Both reveal the fissure’s rock formations, but they require different levels of training and experience.

Guided visits include equipment fitting and a briefing before entering the water. Access involves walking in equipment and using metal steps at the entry and exit platforms, so discuss any mobility concerns with your operator before booking.

For preparation, clothing, and equipment advice, read our guide to diving and snorkeling in Iceland. The overview below explains how each activity offers a different perspective on Silfra.

Snorkeling in Silfra

Snorkeling in Silfra lets you explore submerged lava formations without a diving certification. This is one of Iceland’s outdoor experiences where the scenery lies beneath you, with clear water revealing the depth of the fissure while you remain at the surface.

Grétar describes the gentle current and unhurried pace as part of the experience’s appeal. First-time snorkelers can join, but everyone must be able to swim independently, feel comfortable in the water, and meet the participation requirements.

The cold water requires an insulating suit, even in summer. A drysuit snorkeling tour in Silfra keeps your body dry beneath the suit, with warm layers providing insulation. Its buoyancy helps you float while viewing the fissure below.

A wetsuit snorkeling tour allows water inside the suit, which your body warms. It offers greater freedom of movement and, for confident swimmers, the possibility of duck-diving below the surface. Grétar notes that it can suit people who dislike a drysuit’s constrictive feel.

Compare snorkeling tours to find your preferred suit option and check swimming, health, and equipment-fit requirements. Listings also explain what is included and whether you meet at Silfra or travel from Reykjavik.

Diving in Silfra

A guided diving tour in Silfra offers a submerged view of the fissure’s walls and rock formations. Looking upward toward the light at the surface gives divers a different perspective from snorkelers.

Grétar explains that scuba diving requires appropriate training and experience because participants explore below the surface. The maximum permitted depth is 59 feet (18 meters), even though parts of Silfra extend much deeper.

Scuba divers need an Open Water qualification or equivalent, plus a drysuit certification or accepted proof of recent drysuit experience. Compare diving tours for the full qualifications and participation requirements.

Visitors can meet their guide at the site or join a scuba diving tour from Reykjavik. The total visit includes preparation and changing as well as the dive itself.

Best Time To Visit Silfra

Silfra can be visited year-round, with the water remaining around 35 to 39 F (2 to 4 C). Seasonal differences mainly affect the weather above ground, daylight, road conditions, and the time available for nearby sightseeing.

Visiting Silfra in Summer

Summer in Iceland brings longer daylight hours and generally milder conditions for changing and walking around the park. It also gives you more time to explore Thingvellir before or after entering the water.

Booking your Silfra snorkeling excursion ahead of time helps you secure a departure that fits your Golden Circle plans. Summer is a busy travel season, so preferred dates and times can fill up.

Silfra Snorkeling in Winter

Iceland in winter brings shorter days and possible snow or ice around Silfra. The water temperature stays similar to summer, but preparation and walking between the parking area and fissure can feel much colder.

Plan nearby sightseeing around the available daylight and leave extra time for winter driving. Wear footwear with good grip for the paths, and check for weather-related changes before traveling to the park.

Things To Do Near Silfra

Things to do near Silfra include walking through Thingvellir’s historic assembly area, visiting waterfalls, and exploring other Golden Circle sights. Several park landmarks are accessible on foot, while stops farther along the Golden Circle itinerary require a drive.

Walks Within Thingvellir National Park

Walks within Thingvellir National Park connect historic sights and rift formations near Silfra. Visit Thingvellir Church and Law Rock, associated with Iceland’s Althing assembly, then explore Almannagja Gorge or walk farther to Oxararfoss Waterfall.

In summer, you can also join free ranger-led walking tours in English covering Thingvellir’s history and geology. Walks last about an hour and depart at 10 AM from Thingvallakirkja Church and 2 PM from the Hakid Visitor Center.

Confirm the summer schedule with visitor center staff, as walks may be canceled because of other ranger duties or unforeseen circumstances. In winter, check walking conditions before setting out, as snow and ice can affect the paths.

Facilities Near Silfra

Facilities near Silfra include toilets, visitor information, a cafe, and shops within Thingvellir National Park. These are located around the park rather than concentrated at the Silfra meeting area.

The Hakid Visitor Center is beside P1 and the viewpoint above Almannagja Gorge, with toilets nearby. Staff provide walking information, and the Heart of Iceland exhibition introduces the park’s history and nature.

The Leirar Service Center is beside the campsites near the junction of Routes 36, 361, and 52. It has a cafe, souvenir shop, and information desk, with toilets in the adjacent camping facilities.

Both centers generally open from 9 AM to 6 PM between April and October, and 9 AM to 5 PM between November and March. Holiday hours vary.

Other Stops Along the Golden Circle

Other stops along the Golden Circle include waterfalls, geothermal sights, and bathing spots. Continue east from Thingvellir, then follow the route south to combine Silfra with a full day of sightseeing.

• Laugarvatn Fontana: Continue east toward Laugarvatn for geothermal bathing beside the lake. A Silfra and Fontana combination tour links the two experiences, while the geothermal rye bread experience explores a local cooking tradition.

• Bruarfoss Waterfall: Vivid blue water flows through narrow cascades between Laugarvatn and Geysir. A Golden Circle tour including Bruarfoss incorporates the waterfall into the sightseeing route.

• Geysir Geothermal Area: Continue east to the Geysir area, where Strokkur erupts regularly. Stay on the marked paths around the hot springs.

• Gullfoss Waterfall: Farther along the road from Geysir, the Hvita River drops into a canyon. Viewing paths overlook the two-tiered cascade, one of Iceland’s best-known waterfalls.

• Faxi Waterfall: A broad cascade stretches across the Tungufljot River. It fits a route continuing south toward Reykholt after visiting Geysir and Gullfoss.

• Kerid Crater: A lake fills this volcanic crater on a southern return route toward Selfoss. Admission to Kerid allows visitors to explore the rim and lakeside paths when conditions permit.

Where To Eat Near Silfra

Places to eat near Silfra include the cafe at Leirar and restaurants reached by car around Thingvallavatn and Laugarvatn. For a longer Golden Circle day, you can also plan a meal stop farther along the route.

Grétar recommends eating before your visit rather than arriving on an empty stomach. A large meal is unnecessary, but having eaten beforehand helps when you enter the cold water.

• Leirar Cafe: Located within the park’s service center, this is a convenient stop for refreshments before or after your Silfra experience. It suits a quick cafe break rather than a full restaurant meal.

• Silfra Restaurant at ION Adventure Hotel: Located in Nesjavellir, this restaurant serves lunch and dinner with an emphasis on local ingredients. Expect higher prices, especially for dinner. It requires a drive from the fissure, so reserve a table at Silfra Restaurant ahead of your visit.

• Babylon Bistro at Heradsskolinn: Located in the historic guesthouse beside Lake Laugarvatn, it serves pizza, burgers, and fish and chips. It is a more moderately priced option for a casual meal and fits a route continuing east toward Laugarvatn and Geysir.

Farther along the Golden Circle in Reykholt, Fridheimar serves tomato soup with freshly baked bread, pasta, and other dishes among its greenhouse plants. Expect restaurant pricing even for soup, and reserve a table at Fridheimar ahead of your visit.

Places To Stay Near Silfra

Places to stay near Silfra include campsites within Thingvellir and accommodation around Thingvallavatn and Laugarvatn. The nearby options below start within the park and continue outward toward hotels and guesthouses.

• Leirar campsites: Stay within Thingvellir National Park near its service center, with toilets and showers available. Nyrdri-Leirar operates year-round, while other camping areas have seasonal access.

• ION Adventure Hotel: Located in Nesjavellir, south of Silfra, ION Adventure Hotel offers private rooms and an on-site restaurant. It suits visitors exploring Thingvallavatn and the surrounding geothermal landscape.

• Heradsskolinn Historic Guesthouse: Beside Lake Laugarvatn, Heradsskolinn Historic Guesthouse occupies a former school and offers private rooms and dorm accommodation. Its restaurant and proximity to Fontana suit an overnight stop before continuing east along the Golden Circle.

For more options, browse Golden Circle hotels and accommodations. Staying near Thingvellir suits an early Silfra visit, while accommodation farther east can work for an onward journey toward Geysir, Gullfoss, or the South Coast.

Planning Your Visit to Silfra

Plan your Silfra visit around the sights you want to explore in Thingvellir and along the Golden Circle. You can stay within the park for walking and sightseeing or continue to waterfalls and geothermal attractions farther along the route.

A guided experience introduces you to the fissure with someone who knows its underwater landscape. For Grétar, that introduction came during his guide training 15 years ago.

To experience Silfra for yourself, choose a tour that fits your itinerary. Book a meet-on-location snorkeling tour in Silfra if you have a rental car, a Silfra snorkeling tour with Reykjavik pickup if you prefer not to drive, or a Golden Circle and Silfra snorkeling tour to include sightseeing.