Rebun, Japan

Rebun: Submarine Cable Landing Point

Rebun is a landing point located on Rebun Island, an island in the Sea of Japan off the northwestern tip of Hokkaido, Japan. Situated approximately 50 kilometres off the Hokkaido coast, Rebun Island lies northwest of Rishiri Island, and the two are separated by the Rebun Channel. As an island community, Rebun depends on submarine cable infrastructure to maintain fixed telecommunications connectivity with the broader Japanese mainland network.

One submarine cable lands at Rebun: the Hokkaido-Rebun-Rishiri cable. This cable connects Rebun Island within a domestic Japanese corridor, linking it with Hokkaido and Rishiri Island. The connectivity enabled here is entirely intra-national in character, serving inter-island communications rather than intercontinental or transoceanic routes.

Cables Landing at Rebun

The Hokkaido-Rebun-Rishiri cable is 64 kilometres in length and reached ready-for-service status in 2011. All endpoints on this cable are located within Japan, connecting Rebun Island to Hokkaido and Rishiri Island. The cable's short length and fully domestic routing reflect its purpose as an inter-island link within the Hokkaido island group, providing localised submarine connectivity across the narrow sea channels that separate these northern Japanese islands.

Regional Context

Within Japan's submarine cable landscape, Rebun is one of 68 landing points spread across the country, which together host 51 submarine cables in total. Rebun, with a single cable, sits among the less densely connected landing points in Japan when compared with major hubs such as Shima (12 cables), Maruyama (9 cables), and Chikura (8 cables). Landing points such as Hachijo, Minamiboso, and Naha each host four cables, illustrating the range of connectivity scales present across Japan's extensive coastline.

Network Role

Rebun functions as a single-cable terminus within Japan's submarine cable graph, serving the specific purpose of extending fixed connectivity to Rebun Island via the Hokkaido-Rebun-Rishiri cable. Its role is that of a local access point rather than a transit or aggregation node, channelling communications between the island community and the broader Hokkaido regional network. The cable's 64-kilometre span across the Sea of Japan's near-coastal waters links Rebun with both Rishiri Island and mainland Hokkaido, forming a small but complete inter-island submarine circuit.

The presence of a dedicated submarine cable landing at Rebun illustrates how Japan's overall cable infrastructure extends beyond major international gateways to serve remote island communities, ensuring that even geographically isolated points within the archipelago maintain submarine-based fixed connectivity.