Tours Iceland

What is Silfra Fissure

Silfra Fissure is a natural rift in Thingvellir National Park, where the North American and Eurasian tectonic plates slowly drift apart. Filled by glacial meltwater filtered through lava rock for decades, its water is exceptionally clear and remains 2–4°C year-round.

Unlike a typical dive site, Silfra is a calm, freshwater canyon of submerged rock walls, deep crevices, and shifting light, explored by snorkeling or dry suit diving between continents.

Plan your visit to Silfra

Timings

  • Operating hours: Daily, 9am to 3pm; open all year
  • Seasonal changes: During summer (June–August), extended daylight allows for more frequent departures and later afternoon tours. In winter (November–March), fewer daily slots are available due to limited daylight and weather conditions.

Best time to visit

  • Season by season:

Summer (June–August)

  • Mild temperatures (10–15°C) and long daylight hours make this the most popular time to snorkel. 
  • Shoulder season (April–May & September–October)
  • Fewer crowds and cooler air, with good underwater visibility year-round.

Winter (November–March)

  • Snow-covered lava fields create dramatic scenery and fewer visitors.
  • Best day of the week: Weekdays (Tuesday–Thursday) are typically less busy than weekends, especially in summer.
    Best time of day: Early morning tours provide softer light and fewer groups in the water. Late afternoon departures can also feel quieter, particularly outside peak summer months.

Location

Address: 7V3M+W2Q Thingvellir National Park, 801 Thingvellir, Iceland

  • Nearby landmark: Öxarárfoss Waterfall (1.5 miles)
  • By public transport: With no train or metro network in the region and limited seasonal buses, driving yourself is typically the easiest option.
  • By car: Travel from Reykjavík along Route 36 (Þingvallavegur) toward Thingvellir National Park; the drive takes roughly 45–50 minutes. Once inside the park, follow the signs marked “Silfra” or “P5.”
  • Parking: Use the designated Silfra Car Park (P5), where parking fees apply. From the lot, it’s about a 400-meter walk to the snorkeling meeting area.

Things to do at Silfra Fissure

Snorkel between tectonic plates

Float in crystal-clear glacial water between the North American and Eurasian plates inside Silfra Fissure in Thingvellir National Park. Expect 30–45 mins in 2–4°C water, wearing a drysuit, mask, fins, and thermal layers (all provided on guided tours). Intensity is moderate; you should be comfortable in water. Ideal for first-timers and bucket-list seekers, book a guided slot to secure photos and small-group support.

Certified scuba diving

Explore deeper sections like the Cathedral with a licensed guide. Dives typically last 30–40 minutes and require drysuit certification (or logged drysuit dives). Water remains 2–4°C year-round; full diving gear is provided on tour. Intensity is higher than snorkeling and best for certified divers who want extended bottom time. Reserve in advance due to limited spots.

Scenic walk through the rift valley

Stroll the marked trails of Thingvellir National Park, where lava fields and dramatic rock walls frame the fissure. Easy to moderate terrain; allow 1–2 hours. Sturdy shoes and weather layers are recommended. Great for families or anyone who prefers a dry adventure, pair your walk with a morning snorkel for a full day out.

Combine with a geothermal soak

Balance the cold-water thrill with a warm lagoon visit the same day (popular pairings include oceanfront or countryside hot springs). Minimal intensity; stay as long as you like. Bring swimwear and flip-flops. It’s a relaxed, romantic finish. Choose a combo ticket to streamline logistics and save time.

What to see during your visit

The Big Crack, entrance to Silfra

The Big Crack, entrance to Silfra

A narrow, dramatic channel where you slip directly between two continents. Sheer rock walls and intensely clear water create a surreal first impression.

Silfra Hall, a wide lava corridor
Silfra Cathedral, the deepest point
Silfra Lagoon, shallow, open expanse
Rift Valley landscape, tectonic boundary

History of Silfra Fissure

Silfra lies within Thingvellir National Park, the historic site where Iceland’s national parliament, the Alþingi, was established in 930 AD. For nearly 800 years, chieftains gathered here each summer to debate laws, settle disputes, and shape the nation.

The fissure as we know it today was created after a series of powerful earthquakes in 1789 widened existing cracks in the lava field. These seismic events opened deep fractures between the tectonic plates, allowing glacial meltwater to fill the newly formed canyon.

It wasn’t until the late 20th century that divers began exploring the fissure, drawn by reports of extraordinary water clarity. Word spread quickly within the diving community, and Silfra gained international attention as a rare place where people could float between two continents in freshwater with visibility often exceeding 100 meters.

Today, Silfra is protected as part of Thingvellir National Park, a UNESCO World Heritage Site recognized for both its geological significance and its role in Icelandic history.

Geography of Silfra: How Silfra was shaped over time

Silfra is located in Thingvellir National Park, where the North American and Eurasian plates are slowly pulling apart by roughly 2 cm per year. It is one of the few places on Earth where this continental drift is clearly visible above sea level.

The fissure formed after the major earthquake in 1789 opened cracks in the surrounding lava field. These fractures are filled with glacial meltwater, creating a deep, narrow canyon of submerged rock walls and boulder chambers.

Water from the Langjökull glacier filters through underground lava rock for decades before reaching Silfra. This natural filtration results in visibility often exceeding 100 meters, with water temperatures staying between 2–4°C year-round.

Tips for visiting Silfra

  • Book early in summer: June–August slots fill quickly, especially morning departures with calmer water and fewer groups.
  • Dress smartly: Wear thermal base layers and thick socks under your dry suit; avoid cotton as it traps cold.
  • Eat beforehand: Snorkeling in 2–4°C water is physically demanding; have a proper meal before arrival.
  • Arrive 15 minutes early: Check-in, gear fitting, and safety briefings are mandatory.
  • Consider transfers: If you’re not comfortable driving to Thingvellir, reserve a Reykjavik pickup option for convenience.
  • Choose early or late departures: Morning and late-afternoon tours often feel quieter and offer softer light for underwater photos.
  • Remove jewelry beforehand: Dry suits seal tightly at the wrists and neck, and rings or watches won’t fit underneath.
  • Bring contact lenses if needed: Regular glasses can’t be worn under the mask.

Frequently asked questions about Silfra Fissure

Silfra is a freshwater rift formed between the North American and Eurasian tectonic plates. It’s famous for its exceptionally clear glacial water and the rare chance to float between two continents.

More reads

Snorkeling and diving

Snorkeling and diving

Thingvellir National Park

Thingvellir National Park

Sky Lagoon

Sky Lagoon