Penbal-4

Overview

Penbal-4 is a domestic submarine cable system operating entirely within Spain. With a total length of 317 km, it connects the Spanish mainland with the Balearic Islands, serving the intra-Spanish corridor between Valencia and the islands of Ibiza and Mallorca. The cable is owned and operated by Telefónica, Spain's principal telecommunications provider.

Route and Landings

Penbal-4 has three landing points, all within Spain. On the mainland, the cable comes ashore at Valencia. In the Balearic Islands, it lands at both Ibiza and Mallorca. These landings link the Spanish eastern coastline with two of the most populous islands in the Mediterranean.

Ownership and Operators

Penbal-4 is solely owned by Telefónica, the Spanish multinational telecommunications company. Telefónica is one of the largest telecommunications operators in Europe and Latin America, with a long history of investing in submarine cable infrastructure across the Iberian Peninsula and beyond.

Status and Timeline

Penbal-4 entered service in 1991 and has been operational for approximately 35 years. It was among the earliest submarine cables to land in Spain, where the first recorded submarine cable came into service in 1990. The cable's continued operation reflects sustained demand for connectivity between the Spanish mainland and the Balearic Islands.

Regional Context

Spain hosts 25 submarine cables landing across 41 points, with an average cable length of around 3,550 km. Penbal-4, at 317 km, is a short domestic system by comparison, though it is longer than 54% of other cables touching the same countries. The regional peers that share Spanish landing points — including 2Africa, Africa Coast to Europe (ACE), Grace Hopper, Anjana, Medusa, and Sol — are predominantly long-haul international systems ranging from roughly 7,000 km to 45,000 km in length. Penbal-4 occupies a distinct position as a short-haul, intra-national cable in a corridor otherwise dominated by intercontinental routes.

Strategic Role

Penbal-4 provides direct submarine connectivity between the Spanish mainland city of Valencia and the Balearic Islands of Ibiza and Mallorca. By linking these island communities to the Spanish mainland network, the cable supports telecommunications continuity for territories that rely on undersea infrastructure for their connection to the broader national network. Its focus on domestic island connectivity distinguishes it from the longer international cables that also land in Spain.