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In Iceland, the glaciers are the main hub for adventure travel. Travelers are enchanted with the trove of ice caves beneath and outlying glacier lagoons - but even beyond these attractions, the glaciers themselves are one of the country's most fascinating natural wonders. Below discover the remarkable geology behind these ancient formations, dating back to the last Ice Age.

Read on to get the answers to all of your burning glacier questions and find fun facts about Iceland’s coolest natural attraction…

Do Glaciers Move?

close up view of Solheimajokull glacier

Yes, but extremely slowly. While you might think of glaciers as a block of ice, their geology is a bit more complex than that. Ice caps are made up of fallen snow that has been compressed over many years (often centuries) into a thick and persistent body of extremely dense ice. Due to gravitational forces, the ice “reforms” or changes constantly, causing the glacier to move a meter a day. The movements are extremely slow and unnoticeable to the casual observer. Now you know why we say "glacial pace" to describe anything ultra slow!

How Much Land Do Glaciers in Iceland Cover?

Glaciers cover about 11% of Iceland's land mass, and about 1/10th of the dry land on Earth. Iceland is home to 269 named glaciers, most of which come in various shapes and sizes. The largest ice cap in the country Vatnajokull holds the title as Europe's largest glacier, covering an area of 8,300 sq. km, about three times the size of Luxembourg.

How are Glaciers Formed?

For such a stunning natural attraction, glaciers are created in a surprisingly straightforward way. The simplest explanation for how glaciers are formed is through a decade long process of accumulation and compression of snow. It occurs in conditions where snow falls in the same spot year-round, causing the layers of snow layers to become tightly packed. 


The compression then forces the snow to re-crystallize and form into “grains”. If you’re thinking of sugar, you’re on the right track: They are similar in size and appearance to sugar grains. With time, these grains will enlarge and the air pockets between them will get smaller. This causes the snow to slowly compact and the density increases.

After about two years, the snow will have turned into “firn”. This is the state between snow and glacier ice. Firn is about two-thirds as dense as water. The density will then continue to increase as, over time, the larger ice crystals become even more compressed, causing the air pockets to get even smaller.


What are the different types of Glaciers?

You might imagine glaciers as monolithic blocks of ice, but part of their beauty comes from their distinct features. Glaciers are as unique as the snowflakes they are made from, and appear in a variety of shapes, sizes, and colors. Understanding the individual qualities of a glacier can offer greater insight into their geology and history! 

Mountain Glaciers

As their name suggests, these are glaciers that develop in high mountain regions. They often flow out of ice fields that can span over several peaks or even across a whole mountain range. As you might imagine, they’re particularly awe-inspiring!

Valley Glaciers

Glaciers are often compared to rivers, an especially apt reference when it comes to valley glaciers. These bodies of ice glide down valleys and can stretch for hundreds of miles. Some locals describe their shape as tongue-like as they twist and turn their way down the valley.

Valley glaciers can flow down beyond the snow line and sometimes even reach sea level. When one flows far enough to reach the ocean, it’s often called a “tidewater glacier.” These can then become the origin of icebergs at sea where they can continue their journey for centuries under the right conditions.

Piedmont Glaciers

Piedmont glaciers are the glaciers that spill into quite flat plains from steep valleys, then spreading into bulb-like lobes. They are formed when ice streams down a steep valley and runs out into a flat plain. Some piedmont glaciers are remarkably symmetrical and its truly a sight to behold. 

Cirque Glaciers

These glaciers are typically found high in mountainsides and tend to be quite wide rather than long. They take their pretty French name from the bowl-like hollows they occupy. In a geological sense, a Cirque is a steep-sided hollow on a mountainside or at the head of a valley, formed by (you guessed it) glacial erosion.

Ice Aprons

Ice aprons are glaciers that hang from high mountainsides and are relatively small in size. They are often wide rather than long and have been known to cause avalanches due to the steep incline which they stand against.

Rock Glaciers

When glacial ice is covered by debris, it sometimes forms what we call a “rock glacier”. They are usually formed in steep valleys where both rocks and soil can fall from the hills into the ice, resembling sprinkles on an ice-cream dessert!

Ice Caps

Ice caps, often a subject of climate-related conversation, are essentially miniature ice sheets. They cover less than 50,000 square kilometers or 19,305 square miles. Ice caps mainly form in subpolar and polar regions that have high elevation and, consequently, are quite flat.

Ice Fields

These are quite similar to ice caps, but the difference lies in how they flow.

Like other bodies of water, the flow of ice fields is influenced by underlying topography. These glaciers are pretty easy to locate in Iceland: Langjökull, the second largest glacier in the country, is an ice field.

Ice Streams

The word “stream” suggests a small body of water, but ice streams are enormous masses of flowing ice – sometimes close to 20 meters in width and 150 meters in length. They are quite sensitive to environmental changes such as loss of ice shelves at their terminus or a changing volume of water that flows beneath. Ice streams are set within an ice sheet, so they are surrounded by ice that is flowing very slowly.

Glacier Lagoon

The glacier lagoon is a unique topographic feature that only appears in certain conditions. Iceland’s most famous glacier lagoon is, of course, Jokulsarlon, which flows from the glacier tongue known as Breiðamerkurjökull in Vatnajokull Glacier National Park. As the ice crumbles into the ocean, it melts into icebergs, creating a pool of floating blue and white chunks of ice streaked with ash.

What effect has climate change had on glaciers?

Thanks to climate change, it’s no secret that glaciers around the world are receding at an alarming rate. In 2014, the Okjokull ice cap melted away completely, the largest disappearance (but by no means the only) of a glacier in Iceland. Since then, it’s been stripped of its suffix jokull (“glacier”), and is now known simply as Mt. Ok! According to some researches, deglaciation in Iceland occurs at a rate of about 40 square kilometers per year.

Satellite imagery shows that the Helheim Glacier in Greenland did not alter between 1950 and the year 2000. However, by 2005 this glacier was retreating an astonishing 110 feet per day. Tragically, some glaciers have been declassified as such because they ceased to satisfy the defining criteria, particularly in terms of size. Climate change scientists are predicting the disappearance of many more glaciers over the next twenty years.

The decline of polar bears swimming ashore is also a big indicator of Icelandic climate change. We only have to look to Landnámabók (The Book of Settlement), an Icelandic Saga, to see that polar bears used to cross the pack ice from Greenland on a regular basis. 

During the big Frost winter of 1917-1918, 21 bears were listed and it’s fair to say that more arrived unlisted or undetected. Since 2000, the reduction in pack ice has changed things: Now, in a typical year, there are no visiting bears. In 2016, just one polar bear made her way ashore – the first known visitor for several years.  

There is hope, however. Last year, scientists projected that Iceland’s glaciers would, in fact, increase in 2019. It would be the first time the glaciers didn’t shrink in 25 years. This growth is mostly because Earth’s climate is cyclical, meaning there are warmer periods and colder periods. Though we are still on track to lose many glaciers in Iceland overall, for 2019, at least, there will be some recovery.

How do glaciers benefit our environment?

Even from a purely aesthetic point of view, glaciers are of immense value – crystal structures that you can admire from a distance or up close as you’re walking on (or even through!) them.

However, there is a lot more at stake here than the loss of natural beauty. Glaciers and sea ice perform an important function when it comes to holding back the pace of climate change: Melting glaciers cause sea levels to rise, playing havoc with the planet’s ecosystem; and accelerating the influx of fresh water to oceans and threatening corals, fish, and local wildlife.

Like many of our planet’s treasures, glaciers give us far more than we realize.

Things to Do on a Glacier in Iceland

Iceland’s glaciers are some of the most accessible glaciers in the world. Explore the top of a glacier and all its nooks and crannies on glacier hike. Delve deep beneath the ice in a spellbinding ice cave. Zoom through the snow in Iceland’s icy wonderland. You can even go sea kayaking among the icebergs!

Glacier Hiking

One of the most popular activities in our repertoire is the glacier hike in Iceland. A certified glacier guide can introduce you to all the special features of an ancient glacier. From soot-streaked ice formations to deep crevasses, discover the unique Ice World on top of a glacier. Our glacier tours hike on Vatnajokull glaciers and their outlet glacier tongues like Solheimajokull.

Ice caves

Without glaciers, of course, we wouldn’t have ice caves as well! As glaciers shift and melt, the meltwater runs through the weak parts of the ice, leaving behind a cavern or tunnel that runs through the glacier. These gaps are known as ice caves and are often large enough to explore. From October to April, ice caves tours are one of the most popular activities in Iceland.


Another wildly popular activity you can enjoy year-round is snowmobiling on top of a glacier. Thrillseekers can snowmobile on the surface of several of Iceland’s glaciers. Langjokull is a few hours’ drive from Reykjavik and makes a terrific day trip. Another popular destination for snowmobiling is Vatnajokull, where you can combine snowmobiling with glacier hiking, trekking, or visiting Jokulsarlon Glacier Lagoon.

Sea Kayaking

Did you know that you can sea kayak in Jokulsarlon Glacier Lagoon? The protected waters and floating giant icebergs make this an activity worth exploring. Grab a paddle and wander among the huge icebergs, dressed in brilliant blue, dazzling white and ashen charcoal. Keep your eyes out for a friendly seal!