Into the Glacier Langjokull Ice Tunnel Tour From Reykjavik

Hraunfossar and Barnafoss

Hraunfossar is not a waterfall in the usual sense. It is a kilometre-long line of springs running out from under the Hallmundarhraun lava field and falling into the Hvita, which means you are watching groundwater that has travelled through porous lava emerge in daylight.

Barnafoss is the rapid immediately upstream, tight and violent where the river cuts through rock. The listing allows about 20 minutes at each, which is enough for both viewpoints.

The Horse Farm

A stop of about 40 minutes at a local horse farm breaks the drive. Icelandic horses are the same stock that arrived with the settlers and the breed has been closed to imports for centuries, which is why they look like nothing else in Europe.

It is a filler stop in itinerary terms and one of the better ones, because it sits between two long stretches of road.

Inside the Ice Cap

The main event is about four hours, including the transfer up the glacier in a modified vehicle and the time inside the tunnel. The passages are lit, the floor is level, and crampons are handed out for the sections where it is not.

Snowsuits and boot covers are available to borrow. That is unusual and useful: it means you can do this in ordinary outdoor clothes rather than buying kit for one day.

Why It Is Open All Year

Natural ice caves form in winter when meltwater channels drain and freeze, and they close in spring when the same water re-opens them or the roof thins. That is why the Katla caves are a seasonal product and the operators say the route inside changes through the year.

This tunnel was cut by machines into the ice cap and is maintained. It does not melt out in July, which makes it the reliable option for a summer trip and the only way to stand inside a glacier in the months when the natural caves are gone.

What You Trade

You trade the shape. A natural cave has the sculpted forms meltwater makes and the ash layers that record eruptions; a cut tunnel has straight walls and a level floor with lights along it.

What you gain, apart from the season, is access: level ground, no scrambling and no crawling. For travellers who would struggle on a natural cave floor, this is the version that works.

Lava Under the Ice

The Langjokull ice cap covers volcanic systems, and the lava field the day's waterfalls run out of, Hallmundarhraun, came from an eruption under that same cap about eleven centuries ago. The Vidgelmir cave, the largest lava cave in Iceland, is a tube inside that flow and sits nearby on the Silver Circle route.

So the volcanic story here is one flow told twice: as springs at Hraunfossar and as a walkable tunnel at Vidgelmir. Neither is on the glacier itself.

What You Will Not See

No crater, no lava, no eruption. Nothing is erupting in Iceland at the moment, and the current activity is on Reykjanes, where the Met Office reports uplift at Svartsengi and expects the next intrusion into the Sundhnukur crater row.

If you want volcanic rock rather than ice, the Raufarholshellir lava tunnel is 30 minutes from Reykjavik at $72 for an hour, open 9:00 to 17:00 all year.

The Comparison

Two are ice, two are rock. Only one of the four is open in every month of the year and reached without a specialist vehicle.

Which to Book

If you are in Reykjavik in summer and want to be inside a glacier, this is the listing that delivers it, and the ten hours are the price of reaching the ice cap.

If you are on the south coast in winter, the natural cave under Katla is the better experience at a similar price and a third of the time. If it is simply the inside of the earth you want, the lava tunnel at $72 is the cheapest hour on this site and needs no season at all.