Norway's geography: a country measured along its edge

Why the coastline has no single length

A coastline has no fixed length. It has a length for a given step size, and Norway is where that stops being a curiosity and becomes an administrative question, because almost every figure the state publishes about itself is a figure about an edge.

Kartverket, the national mapping agency, has several answers on file at once. The straight baseline drawn headland to headland, which is the line maritime law works from, runs 2,532 kilometres. Follow the mainland into every fjord and bay and the same coast runs 29,775 kilometres. Add the shoreline of the islands, 73,161 kilometres, and the total reaches 102,936 kilometres. Those are the Kartverket figures compiled between 2006 and 2020. An earlier Kartverket calculation dated 10 October 2016 gave the mainland as 28,953 kilometres and the islands as 71,963 kilometres across 239,057 islands, a total of 100,915 kilometres. English-language reference works print a third pair, 25,148 kilometres for the continental coast and 83,281 kilometres with islands, without stating the step size that produced them.

Counting the islands has the same property. Kartverket registers 320,249 islands and islets, 239,057 of them islands and 81,192 islets, and the split between the two categories is a decision about a threshold.

The land borders are firmer and still not settled to the metre. The land boundary totals 2,564 kilometres, 1,630 against Sweden, 736 against Finland and 198 against Russia on the Kartverket numbers, where the widely reproduced English figures are 2,515, 1,619, 729 and 196. Some of that gap is survey date. Kartverket began walking the Swedish border again in the summer of 2020 and finished in 2024, with the Finnish border completed in 2025.

What those lines enclose is long and thin. The mainland runs 1,748 kilometres from Lindesnes in the south to Kinnarodden in Finnmark, the northernmost point on the European mainland, and the longest straight line inside it, from Lista to Kavringen near Vardø, is 1,790 kilometres. At the widest, measured between Trysil and the mouth of Sognefjorden, the mainland is about 430 kilometres across, or 460 kilometres counting out to the westernmost islands. At Elvenes on Bøkfjorden in Sør-Varanger, 1.7 kilometres separate salt water from the Russian border. The traditional answer to where Norway is narrowest is Hellmobotn at the head of Tysfjorden, 6.3 kilometres from Sweden, and that answer survives because the Sør-Varanger measurements were made later.

What the ice cut and the sea filled

The rock underneath is old and hard. Norway sits on the Fennoscandian Shield, granite and other heat-formed and pressure-formed material between one and two billion years in age, under a cover of limestone, shale, slate and conglomerate 100 to 160 metres thick that was laid down while most of the area lay below sea level between about 540 and 415 million years ago. The folding that followed raised a mountain system continuous with the Caledonian belt, which surfaces again in Scotland, in Ireland and, across the Atlantic, in the Appalachians.

Rivers running west cut gorges into that block along its fracture lines. Then the ice arrived, repeatedly, through the Quaternary, and glaciers tonguing down the V-shaped valleys ground them into U-shaped troughs. When the ice went the sea came in behind it. That is the entire mechanism of a fjord, and it explains how far the deep water reaches inland: Sognefjorden runs 226 kilometres from the open sea and is 1,303 metres deep at the mouth of Vadheimsfjorden, which puts its floor well below the floor of the ocean outside it. Hornindalsvatnet was cut the same way and left fresh, and is 514 metres deep.

Counting the lakes runs into the threshold problem again. Britannica gives about 65,000 lakes with a surface of at least 1.5 hectares, while Norwegian figures in general circulation give about 400,000. Neither is wrong. The small water is either counted or it is not.

The ice also pressed the land down, and the land has not finished coming back. Rebound continues at several millimetres a year, fastest in the east and at the heads of the long fjords where the ice lay thickest. For thousands of years after the ice left, the sea stood over ground that is dry today, and the clay, silt and sand it dropped, found as high as 200 metres above the present shoreline around Oslo and Trondheim, carries much of the country's cultivated soil. Elsewhere the bedrock is simply bare, over roughly 40% of the area.

How the mountains divide the country

The Scandinavian Mountains start at Setesdalsheiene north of the Skagerrak coast and stop only at the Barents Sea. In the south they carry Hardangervidda, a plateau of about 11,900 square kilometres lying around 900 metres above sea level, and Jotunheimen, where Galdhøpiggen reaches 2,469 metres. South of Trondheim the chain swings east through Dovrefjell and Rondane, meets the Swedish border and follows it northeast as Kjølen. In Nordland and Troms it turns alpine again, cuts the coast into fjords and islands, raises the Lyngen Alps and drops away towards the North Cape.

The country is high, and evenly so.

Britannica puts the average elevation at 500 metres against 300 metres for Europe as a whole; the Norwegian figure in common use is 460 metres. 32% of the mainland lies above the tree line.

Those mountains are why Norway has four traditional regions and no single interior. Østlandet lies east of the ranges collectively called the Lang Mountains, drained by valleys running north to south, the longest of them Østerdal and Gudbrandsdal, and holds the Glomma, which runs 623 kilometres, and Mjøsa, at 368 square kilometres the largest lake. Vestlandet lies west of them, where the mountains come down to the water and the fjords cut back in, its one broad flat exception the Jæren plain south of Stavanger. Trøndelag, north of Dovre, is rounder country whose valleys open onto Trondheimsfjord. Nord-Norge begins at about the midpoint of the country and lies mostly above the Arctic Circle.

Off Vestlandet and Nordland a chain of skerries called the Skjærgård runs parallel to the coast and shelters an inside passage over almost the whole 1,600 kilometres from Stavanger to Nordkapp. East of the North Cape the skerries stop, the fjords open out, and Varangerfjord is the one large fjord in the country whose mouth faces east.

Why the coast does not freeze

Norway occupies roughly the same latitudes as Alaska and does not behave like it. The Norwegian Current, the northeastern extension of the Gulf Stream, carries four to five million tons of tropical water a second into the seas around the country, and the southerly air drawn in above that warm water does more work than the water itself. The effect is measurable and it is large. The mean annual temperature on the west coast is 7 degrees, which Britannica sets at 30 degrees above the average for that latitude, and the January mean in the Lofoten Islands, north of the Arctic Circle, is 24 degrees above the world average for the same line.

The fjords do not ice over, even in Finnmark. Every winter month at Bø in Nordland averages above freezing, north of the Arctic Circle. The gap between the coldest and the warmest month is only 10 to 15 degrees on the coast, while inland at Karasjok it reaches 28, so a country 430 kilometres wide holds a maritime climate and a continental one side by side.

Daylight is the one variable the current cannot moderate. The Arctic Circle crossed Norwegian territory at 66 degrees 33 minutes 38.59 seconds north as measured in 2000, on Selsøya offshore and between Bolna and Stødi on Saltfjellet. North of that line the sun stays up from late May to late July and stays down from late November to late January. South of it the summer nights shorten to about four hours of dusk without the sun ever fully clearing the horizon.

Where the rain falls and where it does not

Air coming off the Atlantic is lifted by the first mountains it meets and leaves its water there. Western Norway averages nearly 2,250 millimetres of precipitation a year. Eastern Norway, sheltered behind the same mountains, takes under 760 millimetres. The two sit a few hours apart by road.

The dry extreme is inside the mountains. Saltdal in Nordland averages 211 millimetres a year on the 1991 to 2020 normal and Skjåk in Innlandet 295 millimetres, both of them valleys enclosed on most sides, and some such valleys need irrigation in summer. Finnmarksvidda and the interior valleys of Troms take about 400 millimetres, and Longyearbyen on Svalbard 217 millimetres, which is a polar desert figure.

Timing divides the country along the same seam as volume. On the coast the wettest months are late autumn and winter and the driest are April to June, while east of the mountains precipitation peaks in summer and early autumn and the winter and spring run driest. Sunshine follows a third pattern of its own: the south coast is the dependable one, and the sunniest single month on record, 430 hours, was measured at Tromsø at 69 degrees north.

What actually covers the ground

Statistics Norway measures land cover directly, and its 2026 figures describe a country with very little room in it. Of 323,775 square kilometres, forest covers 37.7% and open firm ground 35.9%. Bare rock, gravel and blockfields account for 8.6%, inland waters 6.3%, bogs 5.5%, and permanent snow and glaciers 0.8%. Agricultural land is 3.5%. Built-up area is 1.8%, which is 5,698 square kilometres for a population recorded at 5,627,400 on 1 January 2026, and 38.6% of that built-up area is transport and technical infrastructure against 22.5% housing.

The county figures spread very wide around those averages. Oslo was 27.5% built up in 2026 and Finnmark 0.3%. Vestfold was 19.4% agricultural land and Østfold 18.8%, against 1.5% in Troms and 0.3% in Finnmark. Vestland was 15.3% bare rock and 3.3% permanent ice. Svalbard was 61% permanent snow and glacier, with no agricultural land recorded at all.

Vegetation stacks in bands, and the bands say the same thing through a different instrument. The nemoral zone, marked by oak and by the absence of spruce, covers 0.5% of the land area, sits below 150 metres and reaches at most 30 kilometres inland along the southern valleys. The hemiboreal zone covers 7%, the south boreal 12%, the middle boreal 20%, the north boreal 28% and alpine tundra 32%. Grain and most other cultivation happen in the hemiboreal and south boreal bands, and barley was traditionally grown as far north as Alta.

Mountain birch draws the tree line where most of the world uses conifers, a pattern found otherwise only in Iceland, in Kamchatka and in the adjacent parts of Sweden. The highest birch forest stands at 1,320 metres at Sikilsdalshorn and the highest single tree at 1,404 metres in Veodal in Jotunheimen. The same line falls to about 500 metres at Narvik, 400 metres at Tromsø, 200 metres at Kirkenes and 100 metres at Hammerfest, where only sheltered pockets hold trees at all.

How the ground gives way

A fjord is a deep narrow tank with mountain walls, and when part of a wall falls in, the water has nowhere to go but up. A section of Ramnefjell dropped into Loenvatnet in Stryn in 1905 and raised a wave 40 metres high that killed 61 people. The same mountain did it again in 1936 and killed 73. A rockslide into Tafjord in Norddal killed 40 in 1934. The geometry that produces those waves is the geometry that produces the scenery, and Norwegian hazard mapping is built around it.

Avalanches take the steep slopes, particularly in the north and in the mountains. Landslides take the marine clay, which is the same raised seabed that carries the farms, and the lowlands near Trondheimsfjord are where they have killed. European windstorms of hurricane strength are ordinary along the coast and over the mountains.

The measured trend is towards more water. Precipitation has risen across most of the country since 1990, particularly in winter, which increases erosion and the risk of landslides, and the 1991 to 2020 climate normals moved many areas into a different Köppen zone from the 1961 to 1990 set. Snow cover has fallen in most populated areas, and the strongest warming on Norwegian territory has been recorded on Svalbard.

Which territories lie beyond the mainland

Mainland Norway with its islands is 323,808 square kilometres. Svalbard with Bjørnøya adds 60,299 and Jan Mayen 377, which makes the Kingdom of Norway 384,484 square kilometres on the Store norske leksikon figures and 385,207 square kilometres in the Kartverket area statistics.

Svalbard is mountains under ice. Spitsbergen alone is 37,814 square kilometres and Austfonna on Nordaustlandet is 8,120 square kilometres of glacier; more than 90% of the eastern archipelago is under ice, and unlike anything on the mainland that ice calves straight into open ocean. Coal is mined there. Jan Mayen, halfway to Greenland, carries Beerenberg, the only active volcano on Norwegian territory.

Three further areas are under Norwegian sovereignty without belonging to the kingdom. Bouvetøya in the South Atlantic is 49 square kilometres and largely glacier, inhabited by seals and birds. Peter I Øy in the South Pacific is 156 square kilometres. Queen Maud Land, the Antarctic sector claim, is given as about 2,741,000 square kilometres reckoned to the pole, though it has never been formally bounded on its coastal side, and Norwegian claims there are held in abeyance under the Antarctic Treaty on the same terms as every other signatory's. The Troll research station stands on a bare slope in Queen Maud Land, the one station in Antarctica not sited on ice.

The water is where the arithmetic turns over. The exclusive economic zone totals 2,385,178 square kilometres: 878,575 along the mainland, 29,349 around Jan Mayen and 803,993 in the zone claimed around Svalbard since 1977. The territorial sea runs to 12 nautical miles and the continental shelf claim to 200. Set beside a kingdom holding 384,484 square kilometres of land, the sea zone is about six times the size, which is a reasonable description of where the country's surface actually lies.