Silfra Fissure

Overview

Silfra Fissure is a glacial spring-fed crack in the earth located in Þingvellir National Park, where the North American and Eurasian tectonic plates meet. This underwater ravine, formed by continental drift and earthquakes, offers some of the world's clearest freshwater for snorkelling and diving, with visibility exceeding 100 metres. The fissure is filled with glacial water that has been filtered through porous lava rock for decades, creating an otherworldly underwater landscape of vibrant blues and ethereal light.

What makes Silfra truly extraordinary is its geological significance and pristine water quality. The water temperature remains a constant 2-4°C year-round, requiring dry suits for all water activities. The fissure stretches approximately 600 metres and reaches depths of up to 63 metres, though most snorkelling and diving activities occur in the shallower sections. Swimming here means literally floating between two continental plates, making it one of the few places on earth where you can touch two continents simultaneously.

The site has gained international recognition as one of the world's top diving destinations, attracting underwater enthusiasts from across the globe who come to experience the unparalleled clarity and unique geological features of this remarkable fissure.

Quick Facts

**GPS Coordinates:** 64.2564°N, 21.1153°W

**Entry Fee:** Þingvellir National Park parking fee: 1,000 ISK (€7)

**Opening Hours:** 24 hours (tour operators typically run 08:00-17:00)

**Best Time to Visit:** Year-round, though summer offers easier access

**Difficulty Level:** Moderate to advanced (water activities require certification or guided tours)

**Nearest Town:** Þingvellir village (8 km), Laugarvatn (25 km), Reykjavík (60 km)

**Water Temperature:** 2-4°C year-round

**Visibility:** 100+ metres

How to Get There

Driving

From Reykjavík, take Route 1 (Ring Road) eastbound for approximately 35 km to the junction with Route 36. Turn left onto Route 36 towards Þingvellir and continue for 15 km. Follow signs for "Silfra" or "P5 Car Park" within Þingvellir National Park. The total journey covers 60 km and takes approximately 50 minutes in good conditions. The route follows well-maintained tarmac roads suitable for all vehicle types year-round.

From Akureyri, take Route 1 westbound for 320 km (approximately 4 hours) to reach the Route 36 junction, then follow the same directions as above.

Parking

Park at the designated P5 car park, specifically signposted for Silfra access. Parking costs 1,000 ISK (€7) for up to 3 hours via the Park & Pay system. The car park accommodates approximately 50 vehicles and includes facilities for tour buses. Payment is by card only through automated machines or mobile app. During peak summer months (June-August), arrive early as the car park fills by mid-morning.

Access

The walk from P5 car park to Silfra platform takes 5-7 minutes along a well-maintained gravel path covering approximately 400 metres. The path is relatively flat with minimal elevation change, suitable for carrying diving equipment. Metal walkways and platforms provide safe access to the water entry points.

What to See and Do

Snorkelling represents the most popular activity at Silfra, offering an accessible way to experience the crystal-clear waters. Tours typically last 30-40 minutes in the water, following the main fissure through four distinct sections: Silfra Big Crack, Silfra Hall, Silfra Cathedral, and Silfra Lagoon. The underwater visibility allows you to see the entire route ahead, creating an almost flying sensation as you drift with the gentle current.

Scuba diving provides deeper exploration opportunities for certified divers, with guided dives reaching depths of 18-22 metres in the main sections. Advanced divers can explore deeper areas reaching 40+ metres, though this requires specific certifications and experience. The diving route covers approximately 600 metres and takes 35-45 minutes underwater.

The fissure walls reveal fascinating geological formations, with dramatic drop-offs, underwater cliffs, and narrow channels carved by millennia of water flow. Algae growth creates vibrant green patches against the dark volcanic rock, whilst the interplay of light and water produces an almost supernatural blue glow throughout the deeper sections.

Photography opportunities abound both above and below water, with the clear conditions allowing for exceptional underwater shots. The contrast between the dark lava rock formations and brilliant blue water creates striking imagery unique to this location.

Best Time to Visit

**June-August:** Peak season offers the warmest air temperatures (10-15°C) and longest daylight hours, making surface conditions most comfortable. However, expect crowds and higher prices. Book tours well in advance.

**September-October:** Shoulder season provides good weather with fewer crowds. Air temperatures drop to 5-10°C, but water activities remain excellent. Autumn colours in the surrounding landscape add visual appeal.

**November-March:** Winter visits offer dramatic scenery with snow-covered surroundings, though air temperatures range from -5°C to 5°C. Shorter daylight hours (4-8 hours) limit scheduling options, but northern lights may be visible during evening visits.

**April-May:** Spring conditions gradually improve with increasing daylight and temperatures rising to 5-10°C. Fewer tourists and competitive pricing make this an attractive period for experienced cold-water enthusiasts.

Water conditions remain constant year-round, so seasonal variations primarily affect surface comfort and accessibility rather than the core underwater experience.

Safety

Hypothermia poses the primary risk due to 2-4°C water temperatures. Dry suits are mandatory for all water activities, and proper thermal undergarments are essential. Tour operators provide comprehensive safety briefings and equipment checks before entry.

Strong swimming ability is required for snorkelling, as the dry suit creates unusual buoyancy that can disorient inexperienced swimmers. Panic responses in cold water can be dangerous, so participants must remain calm and follow guide instructions.

The fissure walls create narrow spaces in some sections, requiring careful navigation to avoid scraping against rocks. Follow designated routes and maintain proper distance from walls to prevent equipment damage or injury.

Weather conditions can change rapidly, creating challenging surface conditions even when water activities remain safe. High winds and precipitation can affect visibility and comfort during surface intervals.

Medical conditions including heart problems, claustrophobia, or recent injuries may preclude participation. Consult tour operators about specific health requirements and restrictions.

Nearby Places

**Þingvellir Visitor Centre** (2 km) provides comprehensive information about the national park's geological and historical significance, plus facilities and exhibitions about Icelandic parliamentary history.

**Öxarárfoss Waterfall** (1.5 km) offers an easy walk to this picturesque waterfall flowing through the Almannagjá gorge, providing excellent photography opportunities and geological insights.

**Þingvallakirkja Church** (4 km) sits beside Þingvallavatn lake, featuring traditional Icelandic architecture and serving as a peaceful complement to adventure activities.

**Laugarvatn Fontana Geothermal Baths** (25 km) provides relaxing hot springs and spa facilities, ideal for warming up after cold-water activities at Silfra.

**Geysir Geothermal Area** (45 km) showcases Iceland's famous geysers and hot springs, forming part of the classic Golden Circle route that many visitors combine with Silfra excursions.

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