Vatnshellir Lava Cave: An 8,000-Year-Old Lava Tube Tour on Snæfellsnes

An 8,000-Year-Old Passage Beneath Snæfellsjökull

Vatnshellir is a lava tube formed roughly 8,000 years ago, when a river of molten rock drained out from beneath a cooling crust and left a hollow tunnel behind. It sits within Snæfellsjökull National Park, near the southern coast of the Snæfellsnes peninsula, in the shadow of the glacier-capped volcano that gives the park its name. Unlike open-air lava fields, the tube’s interior is sealed off from the weather, so the walls keep their original mineral colours — rust reds, blacks, and streaks of gold-yellow sulphur staining — undisturbed by rain or wind.

Why You Can’t Just Walk In

Vatnshellir is closed to unguided visitors. The only way to see it is on a guided tour, run by the site’s licensed operator, lasting about 45 to 50 minutes. A guide leads small groups down a spiral staircase built into the cave mouth, descending roughly 32 metres below the surface through two connected chambers. At the lowest point, the guide typically switches off the lights for a minute so visitors can experience the complete darkness and silence of the tube — a moment regularly mentioned in visitor reviews. The tour suits most fitness levels, but it does involve uneven lava-rock footing and a return climb up the stairs.

Booking Ahead and What to Bring

Tours run at scheduled times throughout the day and sell out during the summer high season, so book a slot in advance rather than turning up and hoping for space. The cave sits at a constant temperature just above freezing year-round, regardless of the weather outside, so dress as if for a walk-in cooler even in July.

• Getting there: Vatnshellir is on the southern side of Snæfellsjökull National Park, close to Arnarstapi and Hellnar — about 75-90 minutes’ drive from Stykkishólmur around the peninsula via Route 54.
• Duration: Guided tour only, about 45-50 minutes, departing at set times.
• Equipment: Helmets and flashlights are provided by the operator.
• What to wear: Warm layers, gloves, and sturdy closed-toe shoes with grip — the rock floor is uneven and can be damp.
• Booking: Reserve ahead, especially June through August, as time slots fill.

Pairing It With the Rest of Snæfellsnes

Most visitors combine Vatnshellir with other stops on the peninsula’s south coast — the basalt arch at Arnarstapi, the black sand at Djúpalónssandur, or the crater at Saxhóll — making it easy to build into a full day looping the peninsula rather than a single out-and-back trip.

Where to Stay

The Stykkishólmur Inn puts you in the walkable old town on Snæfellsnes’s north coast, on the opposite side of the peninsula from Vatnshellir — an ideal base for a full-day loop that takes in the cave tour along with the south-coast sights and Kirkjufell before returning to a harbour-town dinner in the evening. Book direct on Ourhotels.is for the best rate.

Photo: Domenico Convertini via Wikimedia Commons, CC BY-SA 2.0.