Larne, United Kingdom

Larne: Submarine Cable Landing Point

Larne is a town on the east coast of County Antrim, Northern Ireland, situated on the Irish Sea coast. As a landing point for submarine cable infrastructure, Larne connects Northern Ireland with the broader United Kingdom submarine cable network. One submarine cable currently lands at Larne, linking it directly to another part of the United Kingdom through an intra-national undersea connection.

The single cable landing at Larne operates within a domestic corridor, connecting different parts of the United Kingdom rather than spanning international borders. This positions Larne as a node in the internal submarine cable infrastructure of the United Kingdom, providing a subsea link between Northern Ireland and Scotland. The relatively short distance involved reflects the geography of the North Channel, the body of water separating Northern Ireland from the west coast of Scotland.

Cables Landing at Larne

Scotland-Northern Ireland 4 is the submarine cable landing at Larne. With a total length of 85 km, it is a short intra-UK cable connecting Larne in Northern Ireland to a landing point in Scotland. The cable reached ready-for-service status in 2022 and remains classified as a draft-status system. Both endpoints of the Scotland-Northern Ireland 4 cable fall within the United Kingdom, making it an entirely domestic submarine link.

Regional Context

Within the United Kingdom's submarine cable landscape, which spans 125 landing points across 66 cables, Larne hosts a single cable and ranks within the top 88 percent of UK landing points by cable count. Compared to more heavily served UK landing points such as Bude with eight cables, Lowestoft with six, Blackpool with four, and Broadstairs, Porthcurno, and Southport each with three, Larne represents a smaller, more specialised node focused on the Northern Ireland to Scotland corridor rather than serving as a multi-cable international hub.

Network Role

Larne functions as a single-cable terminus in the United Kingdom's submarine cable graph, with its one connection dedicated entirely to an intra-national link between Northern Ireland and Scotland. The Scotland-Northern Ireland 4 cable, at 85 km, is notably shorter than the United Kingdom average cable length of 1,615 km, underscoring its role as a short-haul domestic connector rather than a long-distance intercontinental route.

The presence of a dedicated subsea cable between Larne and Scotland highlights how submarine infrastructure is employed not only for international connectivity but also to bridge parts of a single nation separated by sea. Within the broader UK submarine cable graph, Larne represents the role that short domestic cables play in ensuring connectivity across island and coastal geographies within a single country's network.