Caves in Iceland

Essentially, there are four kinds of caves in Iceland: Lava caves, glacier caves, ice caves and man-made caves. The best thing to do on a rainy day in Iceland is either to go swimming or caving!

For any caving experience in Iceland, you will need a helmet, a headlight and some warm and sensible clothing. There are many caving tours to choose from, all of them include helmets and a headlight.

Following are descriptions of some of Iceland’s most beautiful and popular caves.

Glacier Caves in Iceland

The most famous caves in Iceland these days are the glacier ice caves. The difference between glacier ice caves and ice caves that have nothing to do with glaciers is that ice caves are bedrock caves that contain ice all year round, whereas glacier ice caves are formed within the ice of a glacier.

When you come to Iceland you may want to see a natural blue glacier cave, but they are usually only accessible during wintertime, from approximately mid-October until March. They may open slightly later due to weather conditions, and some operators only take glacier cave tours from November.

Photo from Best Ice Cave Tour in Vatnajokull Glacier Starting from Jokulsarlon Glacier Lagoon.

Glacier caves are often simply called ice caves, but there are also ice caves that may not be inside glaciers - so always make sure to read the description of your ice cave tour so you know what to expect.

Glaciers are constantly moving or crawling, so glacier caves are, therefore, not permanent and vary in size and shape each year. Most glacier caves start forming by water running through or beneath the glacier or due to geothermal heat from volcanoes beneath the ice.

The most known glacier caves in Iceland are formed because of geothermal heat, such as Kverkfjöll glacier caves in Vatnajökull. They were measured to be 2.8 km long with a vertical range of 525 metres in the 1980’s!

If you want to see a glacier cave whilst you are in Iceland, it is best to get in touch with a guide that knows where current glacier caves can be found. They can be hard to find and off the beaten track, your most likely bet is to find them in Vatnajökull glacier, the largest glacier in Europe!

• See also: Ice Caves in Iceland | The Ultimate Guide

Crystal Cave

The Crystal Cave is a natural glacier ice cave that has appeared year after year in Vatnajökull glacier since 2011. Like is mentioned above, the glacier caves always vary from year to year, and are usually only accessible at the coldest time of the year, that is between November and March, except for the new one mentioned above.

This cave can only ever be entered with a guide, as glacier caves are dangerous and constantly shifting their appearance. You'll be provided with crampons, a helmet with a headlight and possibly even an ice axe before entering the cave.

Although the cave's size, both in height and width, changes yearly, visitors are guaranteed views of blue ice, lined with beautiful patterns of black sand and air bubbles. 

This Glacier Ice Cave Tour by Vatnajökull goes to the Crystal Cave whenever it's accessible.

Katla Ice Cave

Photo by Regína Hrönn Ragnarsdóttir 

Another natural glacier ice cave is found near the volcano Katla. However, this is a much darker cave, with predominantly black ice, although blue ice can also be seen.

In fact, there are several small caves accessible here, making this a labyrinth of ice and water to explore. 

• Find Katla Ice Cave Tour | Departure from Vík here.
• Find Katla Ice Cave Tour | Departure from Reykjavik here.

Thrihnjukagigur Cave

The crater Þríhnjúkagígur, east of the Blue Mountains in Southwest Iceland offers the unique experience of exploring the inside of a volcano.

The volcano has been dormant for the last 4000 years and shows no sign of activity, so you are safe to descend right to its bottom. Reminiscent of a citadel and vibrant in colours, Þríhnjúkagígur offers a fascinating adventure into the earth.

Through the crater's opening, you will enter a humongous magma chamber, one of the most amazing natural phenomenon of its kind.

• Book a tour Inside the Volcano here.

Vatnshellir Cave

Photo by Regína Hrönn Ragnarsdóttir 

Vatnshellir cave is found on Snæfellsnes peninsula and is only accessible on a guided tour. To enter it one needs to go down a circular staircase and once down, there is a 200-metre long cave that’s very wide and has a high ceiling.

It is necessary to dress warmly and wear gloves because inside the cave it is cold. The guided tour takes about an hour.

• Book a Snæfellsnes 2 day tour with Vatnshellir cave, whale watching and hot spring here.

Leidarendi Cave

Picture from Leidarendi Lava Tube | Cave Adventure from Reykjavik

One popular cave that’s not far from Reykjavík is Leiðarendi cave. Leiðarendi cave is a lava tube located in the Tvíbollahraun lava field, close to the Blue Mountains, about a 25 minutes drive from Reykjavík.

Leiðarendi is notable for its incredibly diverse and colourful scenery and is considered a prime example of an Icelandic lava tube.

A distinctive feature of Leiðarendi is the various lava flakes that have fallen from its walls and roof, due to frost and erosion. The cave walls are polished by lava streams and filled with stalagmites, stalactites and other fascinating formations. In winter you are likely to see glistening natural ice sculptures in the cave, adding further beauty to the already otherworldly scene.

Beware that there is some climbing and crawling necessary when going through this cave.

Various caving tours can take you to Leiðarendi, but you can also explore it on your own if you have good hiking boots, helmets and head torches. The helmets are very necessary due to the low ceiling in parts of the cave. Please go through the cave respectfully, and do not leave your name in the ceiling.

• Book a cheap tour to Leiðarendi from Reykjavík here.

Raufarholshellir Cave

Photo from Raufarhólshellir | Standard Lava Tunnel Tour.

Raufarhólshellir is very near Reykjavík and is the fourth-longest lava tube in the country. This is a very accessible cave, there's no need to crawl through parts of it as it is from 10-30 metres wide (33-99 feet) and up to 10 metres tall (33 feet). 

The ground is uneven though, so always do take care when walking through and watch your step.

Three gaps in the ceiling where it has caved in bring in a lot of beautiful light, making the cave very atmospheric and perfect for photographs. Those gaps can also provide beautiful ice and snow sculptures in wintertime.

You can explore this cave on a standard 1-hour tour, with or without a pick-up from Reykjavík, or go on a more extreme 3-hour hike.

• Find Lava Tunnel Tours to Raufarholshellir Cave here.

Vidgelmir Cave

Picture from The Cave Explorer | Family Friendly Tour of Víðgelmir Cave

Víðgelmir cave is situated near the town of Reykholt, in west Iceland. It's not too far from the Hraunfossar waterfalls, and can easily be combined with a day tour around that area.

Víðgelmir's beauty mainly lies in its size and the spectacular colours on the inside, that can now be fully enjoyed due to a lighting system that's been expertly installed in specific locations.

There are two large openings in the north end of the cave, and the cave itself is 1585m long, with the largest part of the cave being 15,8m tall and 16,5m wide - resulting in this cave being the largest of its kind in Iceland.

• Book Víðgelmir Cave Explorer tour here.

Lofthellir Cave

Picture from Regína Hrönn Ragnarsdóttir

Lofthellir is a lava cave in North Iceland, situated in the lava field of older Laxárdalshraun.

The Lofthellir lava cave is renowned for having some of the largest, most varied and most beautiful ice sculptures of any lava cave in Iceland and spectacular lava formations as well.

• Here you can book a Caving tour to Lofthellir from Akureyri.

Buri Cave

Photo from Extreme 8 Hour Caving Tour of Buri Cave & Lava Pit with Transfer from Reykjavik

Búri cave is situated on the Reykjanes peninsula and was only discovered in 2005. It quickly became very popular, and in 2014 access to the cave was closed temporarily to protect the site.

Búri's size is 10 metres high, 10 metres wide in its largest chambers and 1 kilometre long. At its innermost section, there's a 17-metre deep vertical pit, made from a lava fall, the deepest lava pit on earth.

The entrance is narrow but once you enter you'll be inside a vast chamber where you can marvel at the cave's spectacular ice sculptures and formations. The ice sculptures are at their most marvellous in winter but the cave used to be accessible during all seasons before its closure.

Having climbed the cave's ice slope you'll go through a rocky tunnel about 700 metres long. Thereafter the floor is relatively flat all the way to the lava pit. 

Mariuhellar Caves

The closest caves to Reykjavík are Maríuhellar in Heiðmörk Nature Reserve, about a 15-minute drive from the city centre. Maríuhellar caves are three in total and popular for locals to bring their kids to.

The most obvious one is Urriðakotshellir cave that’s close to the main road. It’s a large open lava tube in a large grassy lava opening and inside there is a small gap where you can see through to the sky. 

Gjabakkahellir Cave

The cave Gjabakkahellir is also considered a prime example of an Icelandic lava tube, offering breathtaking sights with its many beautiful lava formations and ice sculptures.

Gjabakkahellir—a.k.a. Helguhellir or Stelpuhellir ('Girl cave')—is a lava tube, located in the area of Þingvellir National Park that was formed around 9000 years ago.

You can access that on your own, just be sure to bring the right equipment, i.e. good hiking boots, warm clothing and a helmet with a head torch.

Did you enjoy our article about caves in Iceland? Are there any caves missing from this article that you think we should add? Tell us in the comments.