Atlantic salmon are found across the North Atlantic Ocean basin, from rivers in North America to coastlines stretching from Portugal to the Arctic Circle in Europe. They also range across Iceland and southern Greenland. Unlike their Pacific cousins, which are confined to the western side of their ocean, Atlantic salmon occupy both sides of the Atlantic, splitting their lives between freshwater rivers where they’re born and open ocean waters where they grow to full size.
Native Range in North America
On the western side of the Atlantic, wild salmon historically spawned in almost every river north of the Hudson River in the United States, ranging from Long Island, New York, up through New England and into northern Quebec and Newfoundland. The Connecticut and Housatonic Rivers in Connecticut once held runs, and some evidence suggests salmon reached as far south as Delaware. Lake Ontario supported a native population that has since been wiped out entirely.
Today, the picture is far smaller. Only small numbers of wild Atlantic salmon return to rivers in Maine and eastern Canada. The Gulf of Maine population has been listed as endangered under the Endangered Species Act since 2000 and is considered in danger of extinction. Young salmon born in Maine rivers travel through the Gulf of Maine and out into the open North Atlantic, feeding as far away as the coast of Greenland before returning to their home rivers to spawn.
European Strongholds
Europe holds the bulk of the world’s remaining wild Atlantic salmon. The species ranges from Portugal in the south to Sweden and Finland in the north, but the strongest populations are concentrated in the British Isles, Norway, and Iceland.
Scotland is a particular stronghold. The Rivers Spey and Tay consistently rank among the top salmon rivers in the country, supporting large, high-quality populations with little genetic mixing from hatchery fish. The River Dee on Scotland’s east coast, the Naver flowing north through peatland catchments, and the Grimersta system in the Western Isles all support healthy runs. In Northern Ireland, the River Foyle carries the largest salmon population in the region, accounting for roughly 15% of estimated spawning numbers there.
England and Wales have their own populations, though generally smaller. The River Eden supports one of the largest runs in northern England, while the River Avon in southern England represents a chalk-stream habitat type that’s unusual for salmon. Welsh rivers like the Teifi and Afon Gwyrfai support runs in medium and small montane river systems, respectively.
Beyond the UK, Norway is one of the world’s most important salmon nations, with hundreds of rivers supporting wild fish. Iceland, Ireland, and rivers in the Baltic region of Sweden and Finland round out the European range.
Ocean Feeding Grounds
Atlantic salmon don’t stay in rivers for long once they’re old enough to migrate. After one to several years in freshwater, young fish (called smolts) head to sea, where they feed heavily and grow rapidly in open ocean habitat. The key marine feeding areas sit in the cold, nutrient-rich waters of the North Atlantic.
North American salmon spend their first winter at sea in waters south of Greenland. Most then move to the Labrador Sea off Greenland’s southwest coast for a second year of feeding, though some also use waters off East Greenland. A smaller number of fish return to their home rivers after just one winter at sea, but the majority stay out for two full years before making the journey back. European salmon follow a similar pattern, with many congregating in feeding grounds near Greenland and around the Faroe Islands in the northeastern Atlantic.
Landlocked Populations
Not all Atlantic salmon migrate to the ocean. After glaciers retreated at the end of the last ice age, some populations became permanently trapped in freshwater lakes and never developed a sea-going life cycle. These landlocked fish, sometimes called ouananiche or Sebago salmon, are smaller than their ocean-going relatives but are otherwise the same species.
In Maine, landlocked salmon originally existed in just four river basins: the St. Croix (including West Grand Lake), the Union (including Green Lake), the Penobscot (including Sebec Lake), and the Presumpscot (including Sebago Lake). Stocking programs beginning in 1868 expanded their range dramatically. Maine now supports landlocked salmon fishing in over 300 lakes and roughly 320 miles of rivers and streams, making it one of the largest sport fisheries for this form anywhere in the world. Most waters with self-sustaining wild populations are in western and northern Maine. Landlocked populations also exist in lakes across Quebec, Newfoundland, Labrador, New Brunswick, and Nova Scotia. Lake Champlain, straddling the Vermont and New York border, historically held landlocked fish as well.
Farmed Salmon Around the World
Aquaculture has pushed Atlantic salmon far beyond their native range. Norway and Chile are the two largest producing nations, together accounting for the majority of global farmed salmon output. Scotland, Canada, Ireland, the Faroe Islands, Iceland, and Australia (specifically Tasmania) also operate significant farming industries. Chile’s salmon farms sit in cold fjords along the country’s southern Patagonian coast, thousands of miles from any wild Atlantic salmon population. This global spread means Atlantic salmon are now physically present on every continent except Antarctica, though wild fish remain restricted to the North Atlantic.
How Their Range Has Shrunk
The story of Atlantic salmon geography is partly a story of loss. In the United States, dam construction during the 18th and 19th centuries blocked salmon from reaching their spawning grounds on river after river. The Connecticut River, once one of the great salmon rivers of New England, lost its run entirely. Lake Ontario’s native population disappeared. By the 20th century, wild Atlantic salmon in the U.S. had been reduced to a handful of rivers in Maine.
Europe has seen declines too, though less extreme. Rivers in central and southern Europe that once supported salmon, particularly in France, Germany, and the Iberian Peninsula, have seen populations shrink or vanish due to dams, pollution, and habitat degradation. Restoration efforts in some of these rivers have had mixed results. The healthiest wild populations today are generally found in the least industrialized catchments: northern Scotland, Norway, Iceland, and parts of Ireland, where rivers remain relatively clean and free-flowing.