Tolu, Colombia

Tolu, Colombia: Submarine Cable Landing Point

Tolu is a coastal location in Colombia that serves as a submarine cable landing point on the country's Caribbean-facing shoreline. Two submarine cables come ashore here, connecting Tolu into Colombia's broader domestic and regional cable network. Both cables operate entirely within Colombian territory, making Tolu a node in a domestic coastal connectivity corridor rather than an intercontinental gateway.

The two cables landing at Tolu — the San Andres Isla Tolu Submarine Cable (SAIT) and the Colombian Festoon — together link this landing point to other Colombian coastal and island locations. This positions Tolu as a contributor to the intra-Colombian submarine cable infrastructure that knits together mainland and offshore communities along the country's coastline.

Cables Landing at Tolu

The San Andres Isla Tolu Submarine Cable (SAIT) is 826 km in length and reached ready-for-service status in 2010. As its name indicates, the cable connects Tolu with San Andres Island, both of which are part of Colombia. This system provides a dedicated submarine link between the Colombian mainland coast and one of its Caribbean island territories.

The Colombian Festoon spans 400 km and has been in service since 1997, making it the earlier of the two cables landing at Tolu and notably the first submarine cable to enter service in Colombia. Like the SAIT, its endpoints are entirely within Colombia, forming part of a coastal festoon system that interconnects multiple Colombian landing points along the shoreline.

Regional Context

Within Colombia's submarine cable landscape, Tolu ranks among the mid-tier landing points by cable count, hosting 2 of the 12 submarine cables that land across the country's 10 landing points. Larger hubs such as Cartagena (6 cables) and Barranquilla (5 cables) handle significantly more cable traffic, while Buenaventura, Parque Isla de Salamanca, Puerto Colombia, and Riohacha each host a single cable — placing Tolu above that single-cable tier.

Network Role

Tolu functions as a domestic submarine cable node, with both of its cables operating exclusively within Colombian territory. The SAIT provides a direct link to San Andres Island, supporting island-to-mainland connectivity, while the Colombian Festoon integrates Tolu into the coastal cable chain that runs along Colombia's shores. Together, these two systems make Tolu a dual-cable terminus rather than a simple single-system endpoint.

Within the Colombian submarine cable graph, Tolu's role is specifically oriented toward domestic inter-community connectivity — bridging island and coastal locations — rather than toward international or intercontinental traffic. This places it in a distinct functional category from Colombia's larger internationally connected hubs, reinforcing the importance of having dedicated domestic submarine infrastructure to serve geographically dispersed coastal and island populations.