Discover the Magical Lava Tube Caves in Iceland

Step inside a lava tube cave in Iceland, and you are instantly transported. This is a dark, mysterious world, largely unchanged since lava flowed through and sculpted the landscape thousands of years ago. Born from the island’s fiery depths, these extraordinary tunnels are found across the Land of Fire and Ice.

For travellers who thought they’d seen all there is to see in Iceland, these subterranean chambers offer a different experience. Unlike the dazzling, open landscapes of sparkling glaciers and cascading waterfalls, a lava tube cave has a silent, moody beauty. Its dark allure and rock formations contrast perfectly with the vibrant drama of the island's above-surface attractions.

What Is a Lava Tube Cave in Iceland — and How Are They Formed?

A lava tube cave is a long, hollow tunnel left behind by a river of molten rock. Lava caves form during a volcanic eruption where the lava is extremely fluid and basaltic in composition.

As this stream of lava flows away from the volcano, the outer layer exposed to the cool Icelandic air hardens. The solid crust protects and insulates the lava, which remains superheated and continues to flow. When the eruption ends and the internal flow of lava drains away downhill, the long, hollow, cylindrical shell remains. This empty, tunnel-like passageway promises a unique experience: the chance to stand inside what was once a living lava river.

Top Lava Tube Caves in Iceland to Visit by Car

Good news: many spectacular lava tubes in Iceland are perfectly accessible by road. This is where the freedom of your MyCar rental becomes your best exploration partner. It allows you to easily combine a morning in a lava tube cave in Iceland with an afternoon at a waterfall, without the constraints of a bus schedule.

Raufarholshellir Lava Tunnel

Explore Raufarhólshellir, one of the most famous and longest lava tubes in Iceland. This is the ultimate day-trip caving experience, located just 30 minutes from Reykjavík via Route 39 and Route 417. Note that while driving here is easy, entry is only possible as part of a guided tour.

The Raufarhólshellir lava tunnel stretches over a kilometre in length, with ceilings soaring up to 10 metres (33 feet) high. It’s been carefully developed for visitors, with purpose-built walkways and subtle lighting that reveal its dramatic interior. Inside, the cave walls shimmer with vivid shades of red, green, and gold.

The rainbow-like hues are the result of iron oxidation, minerals deposited in the past, and light playing over moss-covered rock. In winter, Raufarhólshellir transforms into a frozen wonderland, as natural ice sculptures add a glittering layer to its volcanic landscape.

Leiðarendi Cave

Leiðarendi Cave is located in the Bláfjöll (Blue Mountains) area of Reykjanes Peninsula, just around a 30-minute drive from Reykjavík.

The name Leiðarendi grimly translates to "end of the road" after a lamb skeleton was found inside. It’s actually a long tunnel that merges two lava flows from eruptions roughly 1,000 years apart. To navigate its twists, turns, and sometimes low ceilings, you must join a lava tunnel tour with proper gear.

Inside, expect a stunning rock interior in a kaleidoscope of colour as your reward. There are deep reds from iron oxidation, dark greens from moss and algae, and golden tones where minerals have weathered over time.

Víðgelmir Cave

Víðgelmir is the largest lava tube cave Iceland has to offer. It was formed around 930 CE during the eruption that created the Hallmundarhraun lava field. This western giant is a key stop on the popular Silver Circle route, easily reached by car near Húsafell via Route 518.

It provides some of the longest lava caving tours in Iceland, yet maintains excellent visitor infrastructure with well-lit walkways. Visitors marvel at Víðgelmir’s scale and striking formations: rippled walls, frozen drips, and colours left by ancient mineral deposits. This natural wonder also has a touch of history. Archaeologists uncovered Viking-age artifacts, bones, and jewelry here, revealing that early settlers once used the cave as a shelter.

Vatnshellir Cave

Vatnshellir Cave is a highlight on the popular self-drive loop around the Snæfellsnes Peninsula, lying right inside Snæfellsjökull National Park. Formed around 8,000 years ago, it’s one of the oldest lava tubes in western Iceland that visitors can explore. You can reach this key stop easily by car in about two hours from Reykjavík.

The exploration begins with a descent via a circular staircase that plunges visitors 35 metres underground into the cave’s deepest chambers. At its deepest point, guides often switch off the lights to let visitors experience true, total darkness. It’s a truly memorable and unique experience on your Icelandic road trip.

Gjábakkahellir Cave

Gjábakkahellir sits tucked inside Þingvellir National Park, an easy drive from Reykjavík. It’s also a perfect addition to any Golden Circle itinerary. Formed around 9,000 years ago, this lava tube cave in Iceland conveniently opens at both ends. That means visitors can walk directly through its entire 360-metre length.

This cave is ideal for travellers seeking an authentic, rugged experience. At certain points, you’ll even have to use your hands and feet to negotiate the uneven terrain. The stunning rock formations inside are jaw-dropping, with impressive lava falls and delicate "shark tooth" lava stalactites.

What to Expect on a Lava Tunnel Tour

Once you’ve driven your MyCar rental to your chosen cave, you’re set for an unforgettable subterranean journey. Nearly all major lava tube caves in Iceland require an experienced guide for both safety and preservation. Tours usually begin with outfitting essential gear, including helmets and headlamps.

Inside, temperatures stay cool year-round (generally between 2°C and 6°C), even in summer. The terrain can be uneven and rocky, although some caves feature well-constructed walkways. On guided tours, you’ll learn about Iceland’s volcanic history and the geological formations left behind by ancient lava flows.

Best Time to Visit Lava Tube Caves in Iceland

Lava caves in Iceland are ideal because, unlike seasonal glacial ice caves, they are generally accessible year-round for guided tours. The optimal time depends on the atmosphere you seek. Summer offers the best driving conditions, making your self-drive itinerary simple.

However, winter creates a magical atmosphere. Near the entrances of some tunnels, freezing temperatures form natural ice sculptures. It almost feels like you’re entering an Ice Queen’s den! Meanwhile, for a dramatic contrast between fire-born rock and sculpted ice, visit between late November and early April. During these months, temperatures are cold enough for natural ice formations to appear.

Safety Tips and What to Bring

Exploring the Icelandic underworld is a safe and rewarding experience, provided you come prepared. When planning your self-drive day trip to a lava tube cave in Iceland, keep these essential tips in mind:

• Check Conditions: Always check road conditions on road.is and weather forecasts on vedur.is throughout the day, especially if you’re driving outside the capital area.
• Fuel Up: Fill your tank before leaving the city. Gas stations can be scarce in remote areas near some caves.
• Dress in Layers: The temperature inside a lava tube is chilly, regardless of the outside weather. Wear insulating layers, including a warm hat and gloves.
• Wear Appropriate Footwear: The terrain inside the caves is uneven, often wet, and can be slippery. A sturdy pair of good hiking shoes (or boots) with strong ankle support is essential.
• Book Ahead: Always book your guided tours in advance, as cave capacity is limited and spontaneous entry is rarely possible.
• Pack Essentials: Bring snacks and drinks for the road and the time spent waiting for your tour.
• Respect the Environment: Never touch the cave walls or fragile lava formations. Even light contact can damage delicate lava stalactites and stalagmites.
• Choose the Right Vehicle: When visiting a lava tube cave in Iceland during summer, a standard MyCar rental will suffice. Between October and April, a 4x4 vehicle is recommended due to possible snow and ice on rural roads.

Guided Tours vs. Self-Exploration

When planning a trip, the choice often comes down to the support of guided tours versus the flexibility of independent adventure. For Iceland, you can combine both! That is, you can simply self-drive between sights, then book guided tours for the lava caves and other attractions.

Remember, when visiting the major lava tubes in Iceland, such as the Raufarhólshellir lava tunnel, guided access is mandatory. The advantages of these tours are clear: it’s safer, with expert instruction and even educational insight provided by experienced guides. However, there’s no need to sacrifice your freedom or flexibility. The self-drive option embraces independent travel: you choose your pace and schedule, using your rental car to travel between sights.

By combining your flexible drive with pre-booked tours, you ensure safe access to the caves and freedom on the open road.

Experience Iceland’s Underground Wonders

From accessible Raufarhólshellir to mysterious Vatnshellir, visiting a lava tube cave in Iceland offers a glimpse into Earth's moody depths. These incredible tunnels are the perfect counterpoint to the island’s famous surface beauty. Don't miss discovering this hidden side of the Land of Fire and Ice. Take your MyCar rental car for a spin and cruise to these unforgettable subterranean sites on your own schedule. Your underground journey starts now.

FAQs About Lava Tube Caves in Iceland

What is the best lava cave in Iceland?

The “best” cave depends on your interests. Víðgelmir is Iceland’s largest by volume, while the Raufarhólshellir Lava Tunnel is the most easily accessible and developed for tours.

Where is the Lava Tunnel in Iceland?

The Lava Tunnel (Raufarhólshellir) is conveniently located in southwest Iceland, just a 30-minute drive from the capital, Reykjavík.

Is the lava tube worth it?

Absolutely. Exploring a lava tube offers a unique, subterranean perspective on the volcanic forces that shaped Iceland’s dramatic landscape.

How much does it cost to go to the lava tube?

Tour prices typically range from 4,000 to 9,000 ISK (about $30–65 USD) per adult, depending on the cave’s location, tour length, and level of difficulty.

Is it safe to explore lava tubes?

Yes, when done responsibly. Visiting with certified guides is very safe, as tours provide helmets, lighting, and clear safety instructions. Independent exploration is only advised for experienced cavers with proper gear.