Cartagena, Chile

How the Internet Reaches Cartagena, Chile

Cartagena is a coastal commune in the San Antonio Province, within Chile's Valparaíso Region. Situated along the Pacific coast of central Chile, it sits within one of the country's most connected regions by land, though its submarine cable infrastructure is limited to a single domestic connection. International internet traffic reaching Cartagena does not arrive here directly from abroad; instead, it flows through the national submarine cable network that links this point to other Chilean coastal cities.

Cartagena is home to one submarine cable landing point, served exclusively by the Prat cable. This makes it a single-cable terminus rather than a node along a multi-cable international corridor. All submarine traffic arriving at or departing from Cartagena passes through this one connection, routing onward to other landing points along Chile's Pacific coastline.

The Cable Serving Cartagena

The Prat cable is a 3,500 km system that reached readiness for service in 2020, currently listed in draft status. Rather than connecting Chile to another country, the Prat cable operates as a domestic coastal route, linking Cartagena to five other Chilean landing points: Antofagasta, Arica, Caldera, Constitución, and Iquique. These cities span a significant stretch of Chile's coastline, running from the central coast northward into the Atacama and Tarapacá regions. The Prat cable effectively stitches together a chain of Chilean communities along the Pacific shore.

Regional Context

Chile's submarine cable infrastructure comprises 6 cables landing across 14 points nationwide, with an average cable length of 7,208 km and the first cable in service since 2000. Within this network, Cartagena is one of the smaller terminuses, served by a single cable with no direct international landing. By comparison, Valparaíso — also in the Valparaíso Region — hosts 5 submarine cables, making it the dominant hub for international submarine connectivity in the country. Arica, in Chile's far north, lands 3 cables, while Antofagasta, Caldera, and Constitución, like Cartagena, each land only one.

What This Means for Connectivity

Because Cartagena is served by a single submarine cable, all submarine-routed traffic to and from this landing point flows exclusively through the Prat system. An outage on this cable would sever that submarine link entirely. The Prat cable's reach is entirely domestic, connecting Cartagena to other Chilean cities rather than providing a direct path to international networks — meaning international traffic must traverse additional infrastructure beyond the Prat cable itself to reach destinations outside Chile.

The traffic carried on Prat is fundamentally inter-city and inter-regional in character, serving the connectivity needs of communities distributed along Chile's narrow Pacific coastal strip. Understanding Cartagena's position in this network illustrates how a country's internal submarine cable systems play a distinct role from its international links — and why a landing point's cable count and cable type together define what connectivity actually looks like for that location.