Surtshellir Lava Cave: The Wild, Free Cave You Explore Yourself

Most of Iceland’s famous caves come with a ticket booth, a hard hat and a guide. Surtshellir does not. It sits open on the Hallmundarhraun lava field in West Iceland, free to enter and completely undeveloped – no lighting, no walkways, no railings, no one checking on you. If you want raw underground exploration on your own terms, this is the one to point the truck at.

Why Surtshellir Instead of the Ticketed Caves

Ticketed Víðgelmir, just a few kilometres away in the same lava field, is the polished option: boardwalks, lights, a guide. Surtshellir is the opposite. It is one of the longest lava tubes in Iceland – the tunnel itself runs roughly 1.5 to 2 km, and joined with neighbouring Stefánshellir the system stretches about 3.5 km. It was, for a long time, the longest known lava tube in the world. The cave takes its name from Surtr, the fire giant of Norse mythology who is prophesied to burn the world at the end of days – a fair name for a tube carved by a lava eruption dated to around Iceland’s settlement era.

What It’s Actually Like Inside

There is no path. The floor is loose, jumbled lava rubble and collapsed roof blocks, so every step needs watching – this is a place to move slowly and keep three points of contact over the awkward sections. Past the entrance the light drops off fast, and deeper in it is genuinely pitch black. The lowest, westernmost chamber is called Íshellir, the “Ice Cave”, where the floor holds a permanent sheet of ice and ice formations build up. Bring a headlamp with good battery and, ideally, a backup light – a phone torch is not enough for a tube this long and this dark.

Getting There and What to Bring

Access is off Road 518 (the same route as Víðgelmir), then onto the F-road F578. The last stretch of roughly 8 km is rough gravel; a 4×4 is the sensible choice, and many rental agreements forbid this road in a 2WD. The road is closed in winter, so this is a warmer-months trip. Go self-sufficient, because there are no facilities of any kind at the cave.

• Getting there: Road 518 then F578; the final ~8 km is rough gravel needing a 4×4. Check your rental’s F-road rules first.
• Duration: Allow about 1.5 to 2 hours at the cave to explore at a safe pace, plus the drive in and out.
• What to bring: Headlamp plus a backup light, sturdy ankle-supporting boots, gloves, warm layers, and water.
• Timing: Summer only – the F-road closes in winter. Go in daylight so the drive back over the gravel is easy.

Treat it with respect: there is no guide to turn to and no phone signal to rely on, so tell someone your plan, watch your footing, and turn back if conditions or your confidence run out.

Where to Stay

Base yourself at Hvítá Trucks, converted expedition trucks on the bank of the Hvítá river at Hvítárbakki in Borgarfjörður. It puts you already in West Iceland’s lava-and-waterfall country, a short drive from the Road 518 turnoff toward Hallmundarhraun – so you can set out early for the gravel run to Surtshellir and be back to a proper adventure basecamp by evening. Book direct on Ourhotels.is for the best rate.

Photo: Christoph Strässler via Wikimedia Commons, CC BY-SA 2.0.