Sweden's geography: a country still coming out of the sea

How the ice left the ground behind it

The bedrock under most of Sweden is granite and gneiss, and what sits on top of it is till, rock ground out of that bedrock by the ice sheet and dropped where the ice melted. Till from acid bedrock makes poor soil, and forestry and acid rain have added to its acidification, so the ordinary Swedish ground is thin, stony and sour. About one fifth of the country is marsh and peat, concentrated in the rainy south-west and in the cold far north.

The exceptions are what the country was built on. Where the ice pressed the crust far enough down for the sea to flood in, clay settled on the sea floor, and when the crust came back up the clay came with it. Much of central Sweden is covered by heavy fertile sea-bottom clays raised out of the water that way, and scattered patches of clayey till from younger sedimentary limestone in the south weather into brown earth. Those two soils carry most of what Sweden farms, and both are marine deposits now sitting well above the sea.

The ice left water as well as ground. Sweden holds around 95,700 lakes and 39,960 km² of water surface. The coast is rock scoured in a single direction, breaking into hundreds of small, often wooded islands that all share the same rounded shape, a formation Swedish calls skärgård. It occurs on both sides of the country and is thickest around Stockholm and around Gothenburg.

Why the land is still rising

The uplift has not finished. On the High Coast, on the Swedish side of the Gulf of Bothnia, the ground has risen about 285 metres since the ice left it 9,600 years ago; the same UNESCO citation puts around 290 metres of uplift across the past 10,500 years, and the total since the last glaciation at about 800 metres. Present land uplift began roughly 18,000 years ago, when the ice started to melt and the crust began to come free of its weight. The current rate is around 0.9 metres per century, slow enough to need instruments and fast enough to be watched inside a single lifetime. The process was first recognised and studied on these shores, and the serial site Sweden shares with the Kvarken Archipelago on the Finnish side is listed under the geological criterion for that reason.

What the uplift does shows up on a map. Islands appear and then join, peninsulas grow outward, bays are cut off into lakes and the lakes silt down into marsh and peat fen. The Kvarken side carries 5,600 islands built on De Geer moraines, washboard ridges left as the continental ice sheet melted between 24,000 and 10,000 years ago. About 71% of the listed property is sea, and off the High Coast that sea runs as deep as 293 metres.

The border with Finland records the same movement. Sweden's easternmost point is Kataja, an islet in the Bothnian Bay south of Haparanda. When the frontier was fixed there in 1809, after the Finnish War, it ran between two separate islets: Swedish Kataja and smaller Finnish Inakari, with water in between. Uplift has since dropped the sea relative to the land and joined the two into one island, which the border still crosses.

The lowest ground in the country is the same process run backwards by hand. Sweden's lowest point is 2.41 metres below sea level, on the floor of Nosabyviken, once a bay of Lake Hammarsjön at Kristianstad, drained in the 1860s by an engineer named John Nun Milner to win arable land for the town. It now lies inside the Kristianstads Vattenrike Biosphere Reserve.

Where the mountains sit and how high they get

The Scandinavian Mountains, Skanderna in Swedish, form the western edge of the country and carry the border with Norway along its full 1,619 km. The range holds glaciers, the southernmost of them on Helagsfjället near the Norwegian border. All the high summits stand north of the Arctic Circle, in the province of Lapland, inside Norrland, the mountain and forest region that covers about three fifths of Sweden.

Kebnekaise is the country's most closely watched measurement. The mountain has two summits. The southern one is capped by a glacier and was the higher of the two, at 2,104 metres when it was surveyed in 2008. That glacier has been shrinking fast, and the ice-free northern peak, at 2,097 metres, is now the high point of Sweden. The height of the highest ground in the country therefore depends on the year the question is asked, which is a rare thing for a mountain to do.

South of Norrland the relief drops. Svealand is lowland in the east and highland in the west. The South Swedish highlands reach 377 metres and otherwise resemble the Norrland terrain without its deep valleys. Småland, the wooded upland at the centre of the south, sits between 300 and 400 metres on poor and stony soil, and the enormous mounds of stone cleared off its fields over centuries are still standing in them; small factories, more than farms, became the local economy there.

At the southern tip a chain of elongated hills crosses Scania from north-west to south-east. These are horsts along the Tornquist Zone, among them Hallandsåsen, Römelåsen and Söderåsen, and they break up plains that are otherwise flat enough to farm end to end.

How far north the country actually reaches

Sweden runs about 1,600 km from north to south and about 500 km from east to west, between latitudes 55° and 70° N and mostly between longitudes 11° and 25° E. About 15% of the country lies north of the Arctic Circle. Above that line the sun stays up for part of the summer and stays down for part of the winter. Stockholm, well south of it, gets more than 18 hours of daylight in late June and around 6 hours in late December.

Two of those repay a closer look. Stora Drammen is uninhabited by people and carries colonies of seabirds and harbour seals; counting the mainland alone moves the western point to Stensvik in Strömstad and the eastern to Sundholmen in Haparanda. At Smygehuk a signpost on the pier gives the exact position along with the distance to Treriksröset, Stockholm, Berlin, Paris and Moscow.

Sweden holds no external territories, so its extreme points admit only one reading. For Norway and Denmark the same list changes according to whether outlying possessions are counted as part of the country, and for Sweden the question does not arise.

What the rivers and the lakes are for

The rivers of northern and central Sweden are called älvar. They rise in the Scandinavian Mountains and run south-east to the Gulf of Bothnia and the Baltic through long sequences of falls and rapids. The narrower southern ones are åar. The longest watercourse is the Klarälven and Göta älv system, which rises in Trøndelag in central Norway, runs 1,160 km, passes through Vänern and reaches the sea at Gothenburg, dropping over the falls at Trollhättan on its last stretch. The Torne and the Muonio form the frontier with Finland. The Dal marks the transition from Norrland into Svealand.

Vänern, Vättern, Mälaren and Hjälmaren all lie within the Central Swedish lowland, and between them they take up a large part of the southern half of the country. The nineteenth century turned that into a through route. The Göta Canal used the existing lakes and rivers to shorten the passage between the Baltic south of Norrköping and Gothenburg on the west coast, and the same water carried timber down out of the interior.

The falls that make the northern rivers useless for boats are what make them useful for power. Outside the far north, where the rivers are protected, they are dammed, and the large northern lakes serve the same stations. Almost every municipal seat in the country stands on the sea, on a river or on a lake, which is a consequence of a terrain in which water was the road.

What grows between the plains and the tree line

Sweden divides into five vegetation zones, stacked from south to north and from low ground to high. The southern deciduous zone at the bottom belongs to the same belt as Denmark and large parts of central Europe. Beech dominates it, oak forms smaller stands, and hornbeam, hazel, lime, ash, rowan, holly and yew fill it out. Elm once made forest there and has been heavily reduced by Dutch elm disease.

Above it is the southern coniferous zone, bounded on the north by the natural limit of the oak, a line Swedish geography calls the limes norrlandicus, and on the south by the natural limit of spruce. Spruce is not native to the deciduous zone; between about 1870 and 1980 large areas of it were planted there, and across the last forty to fifty years much of that planting has been replaced with deciduous forest. North of the oak line lies the taiga, where pine and spruce dominate and birch is the only broadleaf of consequence. The trees thin out steadily towards the north until it becomes difficult to say whether they form forest at all. Then comes the alpine birch zone, where only a small mountain birch will grow, and above the tree line, which runs between 480 and 880 metres, the bare mountain zone with its heaths, marshes, boulder fields and alpine flora.

Forest covers around 65% of the land area on the narrower count, and 69% on a count that includes woodland, against roughly 8% farmland. Sweden scored 5.35 out of 10 on the 2019 Forest Landscape Integrity Index, a measure of how heavily modified a forest is, separate from how much forest there is.

Gotland and Öland, the two large islands off the south-east coast, sit outside all of this. They are limestone and marl, they carry alvar vegetation adapted to calcareous soils, their flora includes many orchids, and they have landforms the mainland lacks: active cliffs along stretches of their western coasts, sea stacks called rauks, and large cave systems.

The animals divide along the same line. Bears and lynx hold the northern forests, wolves have been recovering after coming close to extinction in the 20th century, and moose, roe deer, foxes and hares are found the length of the country. Herds of domesticated reindeer owned by Sami graze the northern mountains and forests. Anyone in Sweden is entitled to walk through forest and field and pick berries and mushrooms, which makes the lingonberries and blueberries growing under those pines a public food supply.

How the climate has been measured

The national temperature series is calculated by SMHI, the Swedish meteorological institute, from about 450 station records reaching back to 1860. Instruments changed across that period, methods changed, and some stations moved, so the series is homogenised: adjusted to read as though one instrument had stood in one place throughout, with clear errors corrected and missing data filled in. On that series the Swedish mean temperature has risen close to 2 degrees since the end of the 19th century, against about 1 degree for the global mean, and every year since 1988 except 1996 and 2010 has come out warmer than the 1961 to 1990 average.

The reason a country lying at the latitude of parts of Greenland and Siberia is habitable at all is the Atlantic. Low-pressure winds from the south-west carry in air warmed by the North Atlantic Current, which makes the weather mild and changeable, while high pressure from the continent to the east brings clear skies, hot in summer and cold in winter. The interaction between the two produces periodic shifts in the weather that pay no attention to the calendar.

Winter is where the two ends of the country come apart. The average January temperature at Haparanda, at the head of the Gulf of Bothnia, is −12 °C, while southern Sweden averages between −5 and 0 °C in January and its winters vary far more from year to year than northern ones do. The northern interior takes heavy snowfall for up to eight months and temperatures down to between −30 and −40 °C. Sea ice covers the Gulf of Bothnia from November to May; the southern coastal waters seldom freeze. The recorded extremes are 38 °C at Målilla in June 1947 and −52.6 °C at Vuoggatjålme on 2 February 1966.

Summer is where they converge again. The mean July temperature is 15 °C at Haparanda and 17 °C at Malmö, at the opposite end of the country. Spring is the season that travels: measured by average daily temperature it reaches Scania in February and northernmost Norrland only in late May, where it can then arrive almost overnight.

Most of Sweden receives between 500 and 800 mm of precipitation a year, drier than the global average, because the country sits in the rain shadow of the Scandinavian Mountains. The south-west, outside that shadow, takes 1,000 to 1,200 mm, and some mountain areas in the north are estimated at up to 2,000 mm. Annual sunshine runs between 1,100 and 1,900 hours. Late summer and autumn are the rainiest seasons, though precipitation falls throughout the year.

Why most Swedes live on the raised sea floor

The Central Swedish lowland is a broad belt running east to west from Gothenburg to Stockholm, and it is made of the clay the uplift carried out of the Baltic. It interrupts the till-coated forest to the north and to the south of it, and it holds the four large lakes, the ore country of Bergslagen and the hydropower of the rivers crossing it. The belt is uneven, and hills inside it carry thin till where Scots pine and Norway spruce grow in place of crops. The region is the traditional heartland of Sweden on account of its population and its agricultural resources, and it is the ground across which the kingdom traced in Sweden: history was assembled.

The other farmed ground is at the far southern end. The plains of Scania and Halland account for 10% of Sweden's cultivated land and are the country's main agricultural area, with productivity closer to that of southern Europe than to that of the rest of Sweden. Scania is physiographically and economically more like Denmark than like the country it belongs to, and it is Sweden's oldest settled and most densely populated agricultural region.

Everything else is thin by comparison. Norrland covers approximately 60% of Swedish territory at a density below five people per square kilometre, and its mountains and remoter coastal stretches are almost unpopulated. Kiruna municipality on its own covers as much ground as the provinces of Scania, Blekinge and Halland put together, at a density of about one person per square kilometre. Large parts of western Svealand and of southern and central Småland are close to empty as well.

The administrative map lies over that unevenly. Sweden has 25 provinces, landskap, which serve no political or administrative purpose and hold a firm grip on how people say where they are from; 21 counties, län, which do the administering through a board appointed by the national government and a council elected by the county's own voters; and 290 municipalities, ranging from one in Gotland County to forty-nine in Västra Götaland County. Of a population of 10,609,460 as of 1 September 2025, every urban area of 100,000 people or more sits in the southern half of the country, and most of it lives in coastal municipalities.