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What is a glacier?

If you’re thinking of taking a trip to Norway, you may have seen that the country has many glaciers – and many fascinating glacier walks and experiences available to interested visitors. In this article, we’ll give you an overview of what glaciers actually are, how they were made, and tell you a little bit about how you can explore Norway’s magnificent glaciers.
4 min readUpdated: Feb 27, 2026By: The Fjord Tours team
Climber on rocky shoreline with dog, gazing at glacier in the distance, preparing for ice climbing expedition.

What is a glacier?

A glacier is a vast mass of ice that moves very slowly over land, and glaciers are often referred to as “rivers of ice”. Glaciers cover about 10% of the land area on Earth. Some glaciers are thousands of years old – in fact, glaciers are considered remnants of the last ice age, and it was these ancient glaciers that shaped Norway’s well-known fjords and valleys all those years ago.
The word “glacier” comes from the French word ‘glace’, which translates to ‘ice’. The Norwegian word for ‘glacier’ is ‘isbre‘, and the plural is ‘isbreer‘ – so now you know what words to look out for when you visit!
Climbers scaling glacier, ice axes in hand, with crevasses and rugged mountains in the background.

What is a glacier made of?

Glaciers are made of ice and can be several miles long. A glacier consists of several layers of snow that over a very long period of time are gradually compressed into ice. Glaciers are a natural part of our world, and will therefore change depending on the circumstances around them – in Svalbard, glaciers expand during the winter and get smaller in the summer.

How is a glacier formed?

Glaciers form when large amounts of snow stay in the same area all year round so that each new layer of snow is added on top. The new layers of snow begin to compress the previous snow layers, forcing the snow to re-crystallize.
Climbers on icy glacier, roped together, ascending steep terrain under a partially cloudy sky.

What is the difference between a glacier and an iceberg?

While glaciers are large sheets of ice that move very slowly, icebergs are smaller pieces of ice that have broken off from the glaciers. Icebergs usually drift along the ocean currents, while glaciers, which are much bigger, seem more stationary. In fact, glaciers are always moving, but at a slow pace of just centimeters per day.
Glacier descending between towering cliffs, with blue ice, stream below, and lush greenery along the banks.

Are glaciers common in Norway?

In Norway, the fascinating natural phenomenon of glaciers is a fairly common occurrence. In fact, there are 2534 registered glaciers on mainland Norway, in addition to 2100 glaciers on Svalbard. Norway has the most glaciers of any European country, and an estimated 1% of mainland Norway is covered by glaciers.
Faced with increasing temperatures due to global warming, glaciers around the world have begun to slowly melt. This has led to interesting pre-historic finds, such as the recent discovery of the world’s oldest pair of skis in the deep Digervarden ice patch – but it is also a worrying trend. The Center for International Climate Research has found that 326 km of Norwegian glaciers have disappeared since the 1980s.
Making sustainable choices as a traveler will go a long way towards reducing carbon footprint and preserving natural wonders like the glaciers, and there are plenty of ways to explore glaciers in an environmentally-friendly way.
Group of skiers with large backpacks, crossing snow-covered landscape, mountains in the background.

What are the largest glaciers in Norway?

The largest glacier in Norway is Jostedalsbreen, which is also the largest glacier in mainland Europe. Stretching across 487 km, the huge glacier is a part of the famous Jostedalsbreen National Park. The Jostedalsbreen glacier is split into more than 50 glacier arms branching out, including Briksdalsbreen. Located in the beautiful Briksdalen valley, the Briksdalsbreen Glacier is one of the most popular destinations to visit in Norway and is also known as the Olden Glacier.
The second-largest glacier in Norway is Svartisen, which stretches over 370 km. Located in the wild natural landscape of Saltfjellet-Svartisen National Park in Nordland, Svartisen Glacier actually consists of two glaciers.
Folgefonna Glacier is another popular tourist destination for those looking to explore the ancient mysteries of the ice. Folgefonna is a glacier located inside the beautiful Folgefonna National Park, near Odda in idyllic Hardanger. Here, you can explore the natural landscape with a glaciar hike setting off from Bergen or a unique kayak adventure!
These beautiful natural phenomena offer fantastic experiences and views, and there are plenty of opportunities for fantastic glacier hikes along these and other Norwegian glaciers.
A woman climbs out of a crevasse, smiling, as nine mountaineers trek across a glacier with fjords and peaks in the background.

Explore the ice with a glacier walk

Glacier walks are a unique and fascinating outdoor activity that is actually quite common in Norway. Though it may sound a little scary, glacier walks are actually perfectly safe as long as you take precautions. You should never venture out on the ice alone since glaciers can be dangerous – the right way to explore a glacier is on a tour with a knowledgeable guide, and equipped with all the necessary safety equipment.
Glacial walks are well-suited to adventurers as well as families with kids. Hiking along an ancient glacier in Norway is a truly unforgettable experience and a Nordic adventure like none other so be sure to check out our glacier hiking adventures.
Group walking on glacier, wearing bright jackets, helmets, and connected by rope for safety, surrounded by mountains.

Thrill seeking activities

Woman enjoying fjord safari boat tour to Sagofossen waterfall on UNESCO Nærøyfjord in Flåm Norway
Bestseller
Fjord safari Flåm - 2 hr 15 min
Flåm • 2 hr 15 min
From 1110NOK
1 April - 31 October
A person in warm clothing pets two sled dogs in the snow, with a husky standing attentively and a tan dog calmly standing.
Dog sledding in Tromsø
Multiple locations • 7 hr
From 2990NOK
1 December - 31 March
Group in red and black waterproof suits on RIB cruising through calm fjord surrounded by cliffs and snow-capped peaks.
Sea eagle safari to the Trollfjord
Svolvær • 2 hr
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Available all year
Climber ascends cliff above valley, town and river below.
Romsdalsstigen via ferrata - Intro wall
Åndalsnes • 4 hr
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1 June - 20 October
Boat with passengers speeding on glassy Hardangerfjord reflecting mountains and cloudy skies.
RIB boat tour in Ulvik
Ulvik • 1 hr 30 min
From 1345NOK
11 May - 21 September
Zipliner in red jacket soars above a blue river valley.
In high demand
Flåm Zipline, Flåm Railway and bike ride
Flåm • 4 hr
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25 April - 10 October
Climber smiles on cliff with valley and fjord below.
Romsdalsstigen via ferrata - West wall
Åndalsnes • 6 hr
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1 June - 20 October
A black RIB boat on the Lysefjord with passengers raises arms in excitement, mountains rise in the background.
Lysefjord fjord safari with RIB boat
Stavanger • 2 hr
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1 May - 30 September
Guided snowmobile safari through Lyngen Alps forest trails from Tromsø. Winter adventure in Norwegian wilderness.
Snowmobile safari in Tromsø
Tromsø • 7 hr
From 2490NOK
10 December - 31 March
Climber in bright orange shirt and shorts climbing rock face using fixed ladder, smiling with fjord and mountains below.
Trolltunga via ferrata
Multiple locations • 11 hr
From 1750NOK
18 May - 30 October
RIB boat with passengers in yellow jackets approaching a cliff with waterfalls in the Geirangerfjord
RIB boat tour on the Geirangerfjord
Geiranger • 1 hr
From 895NOK
1 April - 1 December
Fjord safari boat tour approaching Sagofossen waterfall in Flåm Norway on summer day
Fjord safari in Flåm- 1 hr 30 min
Flåm • 1 hr 30 min
From 935NOK
1 April - 31 October
A group of six people actively rafting in turbulent water, paddling through strong waves.
White water rafting with lunch in Voss
Voss • 3 hr 30 min
From 1885NOK
9 May - 11 October
Family of three enjoying a meal by a fjord, with a boy reaching for a strawberry and adults laughing.
RIB boat tour with cheese tasting from Flåm
Flåm • 3 hr
From 1395NOK
1 May - 20 September
Motorboat with tourists leaving wake on turquoise fjord with cabins, waterfalls, and peaks.
RIB boat tour to Finnabotn
Balestrand • 2 hr
From 1390NOK
20 April - 11 October
Black RIB boat cruises fjord with green mountains around.
Fjord safari on the Hardangerfjord
Eidfjord • 1 hr
From 795NOK
Available all year
Red inflatable boat speeding through rippling water, carrying yellow-jacketed people, framed by snow-covered mountains.
RIB boat winter tour in Flåm
Flåm • 2 hr 30 min
From 1220NOK
1 November - 31 March
Two climbers captured mid-climb on steep rock face, posing joyfully with fjord and lush green hills in the background.
Trolltunga via ferrata & glamping
Multiple locations • 1 day 4 hr
From 4650NOK
18 May - 30 October
A father and daughter paddling together in a red inflatable boat through mild rapids.
Family rafting in Voss
Voss • 3 hr
From 920NOK
18 May - 11 October
Tourists in safety jackets on RIB  boat ride through turquoise Sognefjord surrounded by lush mountains.
RIB boat tour in Balestrand
Balestrand • 1 hr 30 min
From 1070NOK
11 May - 13 September