Réunion

A single thread across the Indian Ocean

Réunion sits in the southwestern Indian Ocean roughly 700 kilometres east of Madagascar, a geography that shapes its connectivity options as much as any commercial or political consideration. The island's link to the global submarine cable network runs through one documented system: the Lower Indian Ocean Network, known as LION, which entered service in 2009. The cable lands at Sainte-Marie on Réunion's northeastern coast.

At approximately 1,000 kilometres in length, LION is a relatively short system by Indian Ocean standards, designed to connect the island territories and nations of the southwestern Indian Ocean rather than span the full basin. That regional focus gives Réunion a path to onward connectivity through LION's broader network of landing points, but the architecture also means the island depends on a single cable to carry all of its international submarine traffic.

What single-cable dependency means in practice

Reliance on one active submarine cable is a meaningful constraint on resilience. Any unplanned outage — whether from a ship anchor, seabed movement, or equipment fault — affecting LION would leave Réunion without its primary international data pathway until repairs are completed. Cable repair operations in the Indian Ocean are not trivial undertakings; vessel mobilisation, fault location, and splicing all take time, and the southwestern Indian Ocean is not the most densely served region for repair assets.

Satellite capacity can absorb some traffic during an outage, but satellite links carry latency and capacity limitations that make them a partial substitute rather than a genuine alternative for the volumes a modern economy requires.

Geography as both constraint and context

Réunion's position in the southwestern Indian Ocean places it at some remove from the major cable trunk routes that traverse the northern Indian Ocean between Asia, the Middle East, and Europe. Cables that serve the island must either terminate there or make a deliberate diversion, adding length and cost. That dynamic has historically limited the number of systems choosing to include Réunion as a landing point.

The territory's status as a French overseas department means it operates within European regulatory and economic frameworks, which can influence investment appetite for cable infrastructure — though the underlying geographic constraints remain regardless of governance arrangements.

For a more complete picture of how Réunion's connectivity profile may develop, the cable register continues to be updated as new systems are announced, permitted, or brought into service.