Iceland is missing things. Not just any things — things you find absolutely everywhere else. No mosquitoes. No snakes. No reptiles of any kind. Forests that once covered a quarter of the island, now reduced to less than two percent. The reasons are stranger, older, and more fascinating than you might expect.
An Island That Nature Forgot to Finish
Every country has its nuisances. Mosquitoes whining in your ear on a summer evening. Watching where you step in long grass. The dense, airless feeling of a forest in the height of summer. These things are so universal that most travellers pack insect repellent without thinking, step carefully in wild places out of habit, and take the presence of trees for granted as simply part of what a landscape looks like.
Then they arrive in Iceland.
No mosquitoes. Not a single species. No snakes anywhere on the island — not in the highlands, not in the lowlands, not in any zoo outside of a sealed enclosure. And trees? Almost none. A landscape of extraordinary beauty that is also, by the standards of almost every other country on earth, strangely, dramatically bare.
The reasons are not simple. They involve geology, climate, ocean currents, Ice Ages, Viking axes, and a set of ecological circumstances so specific to this one island that they read almost like a deliberate design. Here is the full story — and it is considerably more interesting than most people expect.
No Mosquitoes — The Mystery That Puzzles Scientists
Let us start with the most immediately delightful fact about Iceland: you will not be bitten by a mosquito. Not once. Not even once. In a country with thousands of lakes, rivers, bogs, and wetlands — exactly the kind of standing and slow-moving water that mosquitoes require to breed — there is not a single species of mosquito anywhere in the country.
This is remarkable. Mosquitoes exist above the Arctic Circle in Norway, Canada, Greenland, and Russia — countries far colder than Iceland for much of the year. They exist on the Faroe Islands, just a few hundred kilometres away. They have survived in conditions far harsher than anything Iceland regularly produces. So why not here?
The Leading Theory — Iceland’s Unpredictable Climate
The most widely accepted scientific explanation centres on the extreme instability of Iceland’s climate. Mosquitoes require three specific conditions to complete their life cycle: a period of warm weather to hatch the eggs, a stable period of continued warmth for the larvae to develop, and then another warm spell for the adults to emerge and breed.
Iceland’s weather refuses to cooperate with any of these requirements consistently. The temperature can drop sharply and without warning at any time of year, interrupting the developmental cycle of mosquito larvae before it is complete. In other cold-climate countries, the seasons are more stable — a hard winter followed by a genuine spring, predictable enough for mosquitoes to time their emergence reliably. In Iceland, the weather can switch from mild to freezing and back again within the same week, in any month of the year. The mosquito life cycle, tuned over millions of years to exploit stable seasonal patterns, simply cannot gain a foothold.
The Soil Chemistry Theory
A secondary theory points to the unusual chemistry of Iceland’s water and soil. Much of Iceland’s standing water is influenced by volcanic geology — slightly different in mineral composition and pH from the freshwater environments where mosquitoes typically breed. Whether this is a contributing factor or a coincidental feature is still debated by entomologists.
The Practical Result — and the Midges
Whatever the mechanism, the result is one of Iceland’s most underrated selling points: you can sit outside on a summer evening by a lake, in a wetland, beside a river, in any part of the country, without a single mosquito. Hikers, campers, and midnight sun watchers can enjoy the outdoors without the constant irritation that makes summer evenings unbearable in so much of the northern world.
A small note of honesty: Iceland does have midges — tiny biting insects that appear in certain still, warm conditions, particularly around Lake Mývatn in summer. The lake’s name literally means Midge Lake. They do not bite with the ferocity of mosquitoes, but they are present in impressive numbers on calm summer evenings. Consider it Iceland’s very modest concession to the insect world.
No Snakes — Cold, Isolated, and Inhospitable to Reptiles
Iceland has no snakes. It has no reptiles of any kind outside of captivity. No lizards sunning themselves on rocks. No slow worms in the garden. No grass snakes in the meadow. The island is completely, entirely, reptile-free — and has been for as long as it has existed.
The Geological Explanation — Too Young and Too Cold
Iceland is a geologically young island — formed by volcanic activity on the Mid-Atlantic Ridge over the past 16 to 18 million years. It has never been connected to any continent by a land bridge. This means that unlike Britain, Ireland, or the Faroe Islands — which were all once connected to mainland Europe and inherited their wildlife from that connection — Iceland’s wildlife had to arrive by sea, by air, or by ice.
Reptiles are cold-blooded. Their body temperature is regulated by their environment, which means they depend entirely on external warmth to function. In cold climates, they need reliable seasonal warmth to survive, breed, and raise young. Iceland’s position in the North Atlantic — warmed by the Gulf Stream but still fundamentally cold, dark, and climatically unstable for much of the year — provides no reliable warmth for cold-blooded animals to exploit.
Even if a snake somehow reached Iceland — on a piece of driftwood, in a ship’s cargo hold, carried by a storm — it would find a climate that gives it almost no chance of establishing a breeding population. The growing season is too short, the winters too unpredictable, the warm periods too brief and unreliable for cold-blooded animals to complete their reproductive cycle.
The Same Reason Explains the Amphibians
Iceland also has no native amphibians. No frogs, no toads, no newts. The same combination of geographic isolation and climatic instability that excludes reptiles also excludes amphibians, which are similarly dependent on stable seasonal conditions and appropriate freshwater breeding habitats with specific temperature requirements.
A small population of introduced frogs exists in one location in Iceland — brought over by humans — but they have not spread and do not represent a wild population in any meaningful sense. Iceland remains, effectively, frog-free as well as snake-free.
Almost No Trees — The Story Iceland Is Most Embarrassed About
This one is different. The absence of mosquitoes and snakes is a matter of geology and climate — things beyond human control. The near-total absence of trees in Iceland is, to a significant degree, a human story. And it is one that Icelanders are still working to undo.
Iceland Was Once Forested
When the Norse settlers arrived in Iceland in the 9th century, they found a country that was between 25% and 40% covered in birch woodland and scrub. The Landnámabók — the medieval Book of Settlements — records that the country was ‘forested from mountain to shore’. It was not a dense boreal forest, but it was a genuine, living woodland ecosystem that had established itself after the last Ice Age, covering the lowlands and valley floors of the island.
Today, forest and woodland cover less than 2% of Iceland’s land area. The transformation from 25–40% to less than 2% took roughly 300 years — and it was almost entirely the work of human hands, axes, and hungry sheep.
How the Vikings Destroyed Iceland’s Forests
The Norse settlers needed wood — desperately and immediately. Wood for houses, for boats, for fuel, for charcoal to smelt iron. They cut the birch forests without restraint, because in Norway and Scandinavia, forests grew back. Cut a stand of birch in Norway and within a generation it would be woodland again. The settlers had no reason to think Iceland would be different.
It was different. Critically, devastatingly different. Iceland’s birch forests grew on a thin layer of soil that had built up slowly over thousands of years on top of volcanic rock and lava. When the trees were cut, that soil — unprotected from Iceland’s ferocious wind — began to erode. Once eroded, it was gone. And without soil, the trees could not regrow.
The settlers then introduced sheep — hundreds of thousands of them over the following centuries. Sheep in Iceland grazed on everything. They ate tree seedlings before they could establish. They compacted the soil further with their hooves. They stripped hillsides bare. Every time a birch tree tried to regenerate, the sheep ate it. The forests had no chance.
By the 12th century, most of Iceland’s woodland was gone. By the 14th century, the soil erosion had become catastrophic — entire regions that had been productive farmland in the Viking Age were turning to sand and rock. The ecological damage caused by three centuries of Norse settlement was more severe than almost anything comparable in European history.
Why Trees Struggle to Grow Back
Even without sheep and axes, Iceland’s climate makes tree regeneration genuinely difficult. The growing season is short. The wind is persistent and often violent — the same wind that strips soil from hillsides also batters young saplings before they can establish a root system strong enough to survive. The volcanic soil, where it remains, is thin and nutrient-poor. And Iceland sits at the edge of the range where trees can survive at all — its latitude and ocean climate put it right on the boundary between possible and impossible for most tree species.
There is a famous Icelandic joke that captures the situation perfectly: if you are lost in an Icelandic forest, stand up. The birch woodland that does survive in Iceland is rarely taller than a person’s shoulders — low, wind-sculpted scrub that clings to sheltered valleys and south-facing slopes. Technically forest. Barely.
Iceland Is Fighting Back — The Reforestation Effort
Since the late 19th century, Iceland has been attempting to reverse the damage. The Iceland Forest Service was established in 1907 — making it one of the oldest conservation bodies in the country — and reforestation has been a national project ever since, accelerating significantly in recent decades.
The results are visible. Planted forests of Sitka spruce, larch, and other hardy species now cover parts of the country that were bare rock and sand within living memory. Native birch woodland is being restored in protected areas. The Hallormstaðaskógur forest in East Iceland — the largest forest in the country — has been growing steadily since the early 20th century and now covers nearly 700 hectares.
Iceland has set an ambitious goal: to increase forest cover to 5% of the country’s land area by 2100. It is a long, slow process — trees grow slowly in Iceland’s climate — but it is happening. Visiting the forested areas of East Iceland or the planted woodlands around Akureyri gives a sense of what Iceland might look like in a century, if the work continues.
What Else Is Missing — Iceland’s Unusual Wildlife Gaps
While we are cataloguing Iceland’s absences, a few more are worth noting — each with its own fascinating explanation:
No Native Land Mammals — Except One
Iceland has only one native land mammal: the Arctic fox. Every other land animal present in Iceland today arrived with humans — rats and mice in the Viking ships, reindeer introduced in the 18th century, mink that escaped from fur farms in the 20th century and established wild populations in the countryside. The Arctic fox is the only animal that crossed the frozen sea to Iceland under its own power, walking across the pack ice during the Ice Age and establishing itself before humans arrived.
No Badgers, Foxes, Deer, or Bears
The familiar wildlife of European countryside — badgers, red foxes, roe deer, hedgehogs, squirrels — is entirely absent from Iceland. None of these animals ever had a land route to the island, and none are able to survive the open ocean crossing. The wildlife of Iceland is overwhelmingly marine and avian — seabirds, seals, whales, and fish — with the terrestrial fauna limited to what humans brought, what flew, and the single mammal that walked across the ice.
No Oak, Ash, or Elm Trees
The broadleaf trees that define the forests of temperate Europe — oak, ash, elm, beech — never reached Iceland. The island’s original woodland was almost entirely downy birch and rowan, supplemented by willows and juniper scrub. These are the hardiest species capable of surviving Iceland’s climate, and even they were limited to sheltered lowland areas. The great forests of European imagination — the ancient oak woods, the beech forests of autumn — have no equivalent here.
What Iceland Has Instead — The Remarkable Compensation
Here is the thing about Iceland’s absences: they make room for something else. A landscape without tall trees is a landscape where you can see everything — every ridge, every valley, every glacier, every volcanic formation, every waterfall from miles away. The openness that the lost forests left behind is the openness that makes Iceland’s scenery so dramatically legible, so immediately comprehensible in a way that forested landscapes simply are not.
And what fills the ground where trees once stood? Moss. Iceland has more moss species per square metre than almost anywhere on earth. The vast lava fields of the interior and the highlands are carpeted in an extraordinary living green that cushions every step and glows in the low summer light. It is one of the most distinctive things about the Icelandic landscape — and it only exists because the trees are gone.
Without mosquitoes, Iceland’s summer evenings belong entirely to the visitor. Without snakes, the lava fields and highland trails can be walked without a moment’s anxious attention to the ground. Without dense forest, the horizon is always visible, the weather always readable, the landscape always open.
Iceland is a landscape of extraordinary absences. What is not there is as much a part of the experience as what is.
Fast Facts
Mosquito species in Iceland: Zero — Iceland is one of very few countries in the world with no mosquito species at all
Snake species in Iceland: Zero — no wild snakes or reptiles of any kind exist outside captivity
Current forest cover: Less than 2% of Iceland’s total land area
Original forest cover: Estimated 25–40% at the time of the Viking settlement in the 9th century
Main cause of deforestation: Viking settlers clearing land for farming, building, and fuel — followed by centuries of sheep overgrazing
Only native land mammal: The Arctic fox — the only mammal to reach Iceland under its own power
Iceland’s reforestation target: 5% forest cover by 2100
Largest forest in Iceland: Hallormstaðaskógur in East Iceland — approximately 700 hectares
The famous Icelandic forest joke: If you are lost in an Icelandic forest, stand up
Iceland does have midges: Particularly around Lake Mývatn in summer — the lake’s name literally means Midge Lake
A Country Shaped by What It Lost
Every landscape is shaped by its history — by geology, by climate, by the species that arrived and the ones that didn’t, by the things humans did and the things they left undone. Iceland’s history is unusually visible. The treeless hillsides record a thousand years of human decisions. The absence of mosquitoes on a warm summer evening is a gift from an unstable climate. The bare lava fields, carpeted in moss and nothing else, tell the story of an island that nature built slowly and humans changed quickly.
Understanding what is missing from Iceland — and why — makes everything that is here more meaningful. The moss is not just scenery. It is the ground cover of a forest that no longer exists. The open horizon is not just beautiful. It is the view that was hidden for centuries under birch canopy, and which may one day be hidden again.
At Iceland Paradise Tours, we love telling guests these stories — because a landscape you understand is a landscape you experience more deeply. Iceland rewards the curious traveller. And the questions that seem simple — why are there no trees? where are all the mosquitoes? — turn out to have the most interesting answers.
Come and see what Iceland has instead. It is more than enough.