Stakkholtsgjá Canyon: Þórsmörk's Secret

Deep within the rugged wilderness of Þórsmörk lies one of Iceland's most enchanting hidden gems – Stakkholtsgjá Canyon. This narrow, moss-draped gorge remains delightfully off the beaten path, offering intrepid hikers a fairy-tale landscape that feels worlds apart from Iceland's more famous attractions. With its towering walls of columnar basalt and emerald carpet of moss, Stakkholtsgjá represents the very essence of Iceland's mystical appeal.

The Hidden Gorge

Stakkholtsgjá Canyon stretches approximately 2 kilometres through the heart of Þórsmörk's volcanic landscape, though most visitors explore the easily accessible first kilometre. The canyon's name, roughly translating to "stack gorge," refers to the distinctive basalt columns that form its walls – geological masterpieces created during ancient volcanic eruptions when lava cooled slowly, forming these remarkable hexagonal pillars.

The gorge reaches depths of up to 100 metres in places, with walls that narrow to mere 2-3 metres apart at certain points. During Iceland's brief summer months, the entire canyon transforms into a verdant wonderland as thick moss blankets every surface, creating an otherworldly green tunnel that photographers dream of capturing.

Geological Marvel

The canyon's formation tells the story of Iceland's violent volcanic past. Created by the Stakkholtsgjá river cutting through layers of basalt over millennia, the gorge exposes rock formations dating back roughly 10,000 years. The distinctive columnar basalt formations result from the slow, uniform cooling of lava flows, creating these natural architectural marvels that appear almost too perfect to be natural.

What makes Stakkholtsgjá particularly special is its preservation. Unlike many of Iceland's geological features that face constant weathering from harsh Atlantic storms, this sheltered canyon maintains its moss covering throughout much of the year, creating a microclimate that supports unique vegetation rarely found elsewhere in Iceland.

The Trail Experience

Getting There

Reaching Stakkholtsgjá requires commitment. The canyon lies within Þórsmörk Nature Reserve, accessible only by 4WD vehicles or specially designed highland buses. From Reykjavík, the journey takes approximately 2.5 hours via Route 1 and the infamous F249 mountain road, which includes multiple unbridged river crossings that absolutely demand proper highland vehicles.

Highland bus services operate from June through September, with companies like Reykjavík Excursions and Trex running daily services to Þórsmörk's main huts. Expect to pay around 6,500 ISK (€45/£38) each way for bus transport from the BSÍ terminal in Reykjavík.

The Approach

From Básar hut, the main accommodation facility in Þórsmörk, the trail to Stakkholtsgjá canyon begins with a scenic 3-kilometre walk along well-marked paths. The route initially follows the Krossá river valley before turning southeast towards the canyon entrance. Allow 45 minutes to 1 hour for this approach, depending on your pace and the inevitable photo stops along the way.

The trail difficulty rates as moderate, suitable for anyone with basic hiking fitness. However, proper hiking boots with good ankle support are essential, as the path crosses loose volcanic scree and can become muddy during Iceland's frequent rain showers.

Exploring the Canyon

The canyon entrance appears almost suddenly – a narrow cleft in the landscape that seems to swallow the small river flowing into it. Here begins the real adventure. The initial section allows comfortable walking along the stream bed, but as you progress deeper, the canyon narrows dramatically.

Within 500 metres, you'll encounter the canyon's most photogenic section, where moss-covered walls rise vertically on both sides, creating a natural cathedral of green. The light filtering down creates an ethereal atmosphere that changes throughout the day – morning visits offer softer, more diffused lighting, while afternoon sun creates dramatic contrasts between light and shadow.

At roughly 800 metres into the canyon, you'll reach a small waterfall that blocks further progress for most visitors. Advanced scramblers can continue beyond this point, but the route becomes significantly more challenging and potentially dangerous.

Best Time to Visit

The optimal window for visiting Stakkholtsgjá runs from June through September, when highland access roads remain open and the moss displays its most vibrant colours. July and August offer the most reliable weather and longest daylight hours, though these months also see the highest visitor numbers.

For photography enthusiasts, late August through early September provides exceptional opportunities. The moss reaches peak vibrancy, autumn colours begin appearing on surrounding vegetation, and tourist numbers decline significantly.

Weather remains notoriously unpredictable in Þórsmörk throughout the season. Even summer days can bring sudden temperature drops and heavy rain, making waterproof clothing and layers absolutely essential.

Practical Considerations

Accommodation

Básar hut offers the closest accommodation, providing basic sleeping bag accommodation for around 7,500 ISK (€52/£44) per night. Book well in advance through the Útivist hiking association, as spaces fill quickly during peak season.

Alternatively, Volcano Huts operates more comfortable facilities nearby, with private rooms available from approximately 18,000 ISK (€125/£105) per night.

Safety Notes

Never attempt this hike alone – the remote location and potential for sudden weather changes make group travel essential. Inform others of your hiking plans and expected return time.

Stream crossings within the canyon can become dangerous during heavy rainfall or snowmelt. If water levels appear high or fast-moving, turn back immediately.

Mobile phone coverage remains sporadic throughout Þórsmörk, so don't rely on GPS or emergency calling capabilities.

The Secret Remains

Despite Iceland's growing popularity, Stakkholtsgjá canyon maintains its secretive character. The challenging access route and lack of tour bus accessibility ensure that only dedicated hikers experience this natural wonder. For those willing to make the journey, Stakkholtsgjá offers something increasingly rare in modern Iceland – genuine solitude amidst breathtaking natural beauty.

This moss-draped gorge represents everything that makes Þórsmörk special: raw volcanic landscapes, challenging accessibility, and rewards that match the effort required to reach them. In a country where natural wonders often face overcrowding, Stakkholtsgjá remains wonderfully, mysteriously hidden.

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