The Øresund Link is a 16-kilometre road and rail crossing between Copenhagen and Malmö that opened on 1 July 2000, combining a 7,845-metre cable-stayed bridge, an artificial island called Peberholm, and a 4,050-metre immersed tunnel under the Drogden shipping channel. The bridge alone is frequently called the Øresund Bridge, but the tunnel is what made the crossing possible — a continuous bridge would have obstructed both the main shipping lane into the Baltic and the approach to Copenhagen Airport.
Three Structures Doing Three Different Jobs
The crossing is best understood as a sequence rather than a single object. From the Swedish side at Lernacken outside Malmö, a two-level bridge carries a four-lane motorway on the upper deck and a double-track railway on the lower deck. Its central cable-stayed span is 490 metres, carried on four pylons of 204 metres — the tallest structures in Sweden — and it gives 57 metres of clearance beneath, enough for most but not all vessels.
The bridge ends on Peberholm, an artificial island roughly 4 kilometres long built from material dredged out of the strait during construction. There, road and rail descend and enter the Drogden Tunnel, an immersed-tube tunnel made of twenty prefabricated concrete segments — each around 176 metres long and weighing on the order of 55,000 tonnes — cast on shore, floated into position, sunk into a dredged trench and joined underwater. The tunnel surfaces on Amager, the Danish island that holds Copenhagen Airport and part of the city.
The two-level arrangement was not a preference but a constraint. Rail requires far gentler gradients than road, so stacking them keeps both within tolerance through the tunnel descent while sharing one set of foundations.
Why It Had to Dive
The Øresund is one of the three Danish straits connecting the Baltic Sea to the Kattegat and the North Sea, and it carries heavy commercial traffic. The Drogden channel is the navigable route on the Danish side. A continuous high bridge across the whole strait would have created a permanent navigational pinch point in international waters, and Baltic states had a direct interest in that not happening.
The second constraint sat directly overhead. Copenhagen Airport at Kastrup is on Amager, a short distance from the Danish landfall, and bridge pylons anywhere near its approach paths were unacceptable to aviation authorities. Between the shipping channel and the flight paths, the Danish end of the crossing had to go under.
Environmental conditions added a third constraint that shaped construction more than the finished form. The Øresund is the main channel through which salt water exchanges between the North Sea and the brackish Baltic. Restricting that flow would alter salinity and oxygen conditions across a large marine area. The design was held to a "zero solution" — the finished crossing had to leave water flow through the strait essentially unchanged — and compensatory dredging was carried out to offset the blockage created by the piers and the island.
Building It Between 1995 and 2000
Denmark and Sweden agreed the link by treaty in March 1991. Construction started in 1995 and the two halves met in August 1999, when the bridge sections were joined. Queen Margrethe II of Denmark and King Carl XVI Gustaf of Sweden opened it on 1 July 2000.
- Total link length: about 16 km, of which bridge 7,845 m, Peberholm about 4 km, tunnel 4,050 m
- Main span: 490 m, cable-stayed
- Pylon height: 204 m
- Navigational clearance: 57 m
- Tunnel elements: 20 immersed concrete segments
- Cost: roughly 30 billion Danish kroner at 2000 prices, financed by debt serviced from tolls rather than from tax revenue
The financing model matters to how the crossing behaves. Øresundsbro Konsortiet, jointly owned by the Danish and Swedish states, borrowed against future toll income. Cars pay a substantial toll each way; rail passengers pay an ordinary ticket. Traffic came in below forecast in the early years and debt repayment ran behind schedule, but volumes rose steadily from the mid-2000s and the consortium has been paying down principal since.
Peberholm, the Island Nobody Planted
Peberholm — "Pepper Islet", named in counterpoint to the natural island of Saltholm just to the north — is the most quietly interesting part of the project. It was built from dredged seabed, and rather than landscape it, the authorities decided to leave it alone and let whatever arrived colonise it.
The result is a controlled experiment in primary succession that biologists have surveyed annually since 2000. Several hundred plant species have established themselves, along with breeding birds including terns and gulls, spiders, beetles and even a population of green toads. Access is restricted to researchers, which is precisely why it works — there is very little human disturbance on a strip of land in the middle of a busy strait.
The Øresund strait itself also benefited indirectly: it has been closed to bottom trawling since 1932 because of the shipping density, and its seabed is consequently in far better condition than comparable areas of the Kattegat.
What It Did to Copenhagen and Malmö
Before 2000 the two cities were 45 minutes apart by ferry and functioned as separate labour markets. The bridge cut the rail journey to about 35 minutes city centre to city centre and turned them into one commuting region, usually called the Øresund Region, with roughly four million people across both sides.
The flow has been strongly asymmetric. Swedish housing was cheaper and Danish wages higher, so the dominant pattern became people living in Malmö and working in Copenhagen — tens of thousands of daily crossings at peak, the majority by train. Malmö itself was in the middle of a difficult transition when the bridge opened, having lost the Kockums shipyard that had been its industrial anchor; the crossing, Malmö University and the Turning Torso redevelopment at the Western Harbour were all part of the same reinvention.
Integration proved reversible under pressure. Border checks introduced in 2015 during the European migration crisis, and again during the 2020–21 pandemic closures, cut commuter numbers sharply and demonstrated that the infrastructure creates the possibility of a joint region but does not guarantee it. Differences in tax and social-insurance rules between Denmark and Sweden remain a persistent friction for cross-border workers.
Measured Against the Great Belt and the Fehmarn Belt
The Øresund Link is the middle piece of a longer Scandinavian programme. The Great Belt Fixed Link, opened for rail in 1997 and road in 1998, connects the Danish islands of Funen and Zealand; its East Bridge has a 1,624-metre main span, more than three times Øresund's, and was for years among the longest suspension spans in the world. It also uses a bored rail tunnel alongside a bridge, for similar navigational reasons. Great Belt is domestic infrastructure; Øresund is international, which is why it needed a treaty and a binational consortium.
The Fehmarnbelt Fixed Link now under construction between Lolland in Denmark and Fehmarn in Germany takes the opposite approach to Øresund: it is an immersed tunnel for the entire 18-kilometre crossing, with no bridge section at all. At that length it will be the longest immersed tunnel in the world, and the choice reflects both ferry and shipping traffic in the Fehmarn Belt and lessons learned about weather closures on long exposed bridges.
Together the three convert a route that once required two ferry crossings into a continuous road and rail corridor from Hamburg through Copenhagen to Malmö and onward into Sweden. Øresund was the piece that crossed a national border first, and the one that showed a bridge-tunnel hybrid could satisfy shipping, aviation and marine-ecology constraints simultaneously.
Crossing It, and the Series That Made It Famous
By car the toll is charged at the Swedish end; a BroPas subscription cuts it substantially and is worth arranging in advance for anyone crossing more than once. Pedestrians and cyclists cannot use the link at all — there is no footway or cycle path, and the practical alternative for cyclists is the Helsingør–Helsingborg ferry at the northern end of the strait, a twenty-minute crossing where the two coasts are only about four kilometres apart.
By train, Øresundståg services run frequently between Copenhagen Central and Malmö Central, calling at Copenhagen Airport, which makes the airport a genuinely shared facility for both countries rather than a Danish one. The rail journey is the only way to appreciate the tunnel section, since the road deck sits above it.
The crossing acquired an unexpected second life in 2011 with Bron/Broen — "The Bridge" — a Danish-Swedish crime series that opens with a body placed precisely on the border line at the midpoint of the span, forcing the two countries' police forces to work together. It ran four seasons, was remade in English, French-British and Russian-Estonian versions, and did more to fix the structure in the public imagination than any amount of engineering commentary. The border itself is marked on the roadway, and the midpoint is on the bridge section, not in the tunnel.
For the city at the Danish end and the way the airport, the bridge and the metro fit together, the guide to Copenhagen covers the wider transport geography that the link plugs into.