Fehmarn Bält

Overview

Fehmarn Bält is a short intra-European submarine cable spanning approximately 20 km across the Fehmarn Belt strait between Denmark and Germany. It connects the two countries across one of the narrower crossings of the western Baltic Sea and is owned and operated by Arelion.

Route and Landings

In Denmark, the cable lands at Rodbyhavn, situated on the southern coast of the island of Lolland, facing the strait toward Germany.

In Germany, the cable lands at Puttgarden, located on the northern tip of the island of Fehmarn, directly opposite the Danish terminal.

Ownership and Operators

Fehmarn Bält is owned by Arelion, a wholesale network operator that provides international carrier services across Europe and beyond.

Status and Timeline

The cable entered service in 2000 and has been operational for approximately 26 years, making it one of the longer-serving submarine links in the Denmark–Germany corridor.

Regional Context

The Fehmarn Belt corridor is served by a number of other submarine cables of considerably greater length. Peers in the broader Denmark and Germany corridor include Atlantic Crossing-1, C-Lion1, COBRAcable, Havfrue/AEC-2, Havhingsten/North Sea Connect, and Aurora, most of which serve longer transoceanic or inter-regional routes. At 20 km, Fehmarn Bält is shorter than the majority of cables touching the same countries — longer than only around 11 percent of the 19 other cables in this corridor — reflecting its focused, point-to-point function across a narrow strait rather than a broad intercontinental purpose.

Denmark has 23 submarine cables landing across 30 landing points, while Germany hosts 8 cables across 7 landing points, illustrating that both countries are active participants in European submarine cable infrastructure. Fehmarn Bält predates several of the more recent cable deployments in this corridor, having been ready for service before the widespread expansion of Baltic and North Sea cable routes seen in the 2010s and 2020s.

Strategic Role

Fehmarn Bält provides a direct, short-distance submarine connection between Denmark and Germany across the Fehmarn Belt. Its two-terminal configuration — Rodbyhavn on the Danish side and Puttgarden on the German side — mirrors the established ferry and transport corridor between the two islands and supports telecommunications connectivity between the two countries at one of their closest geographic points. As a cable now in its third decade of service, it represents an enduring fixed link in this segment of the western Baltic.