DOS CONTINENTES l & ll: A Short Submarine Cable Connecting Spain's Coasts
The DOS CONTINENTES l & ll submarine cable system is a relatively short fiber-optic network spanning 95 kilometers along the southern coast of Spain. Owned by GTD España and recorded as ready for service in 2020, the cable connects four landing points:
La Línea,
Playa de Benitez,
Playa de la Ribera, and
Tarifa. It is listed as in service and operational, though key technical details such as design capacity, fiber pair count, and supplier remain undisclosed in public records.
What makes DOS CONTINENTES l & ll notable is its geographical focus. Unlike many submarine cables that traverse international waters, this system exclusively serves coastal regions within Spain. Its short length and domestic route suggest a specialized function, potentially supporting local connectivity or acting as a redundant link for terrestrial networks. However, the absence of detailed public documentation leaves aspects of its purpose and technical specifications open to interpretation.
Quick facts
| System Name | DOS CONTINENTES l & ll |
| Length | 95 km |
| Ready for Service | 2020 (GeoCables database value) |
| Owners | GTD España |
| Status | In service |
| Design Capacity | Not disclosed |
| Fiber Pairs | Not disclosed |
| Supplier | Not disclosed |
| Technology | Not disclosed |
| Landing Points | La Línea, Playa de Benitez, Playa de la Ribera, Tarifa (Spain) |
Route
The DOS CONTINENTES l & ll cable connects four landing points along the southern coast of Spain:
- **La Línea**: Situated near Gibraltar, La Línea is a key urban area for telecommunications in the region.
- **Playa de Benitez**: A beach near Ceuta, a Spanish autonomous city on the northern coast of Africa.
- **Playa de la Ribera**: Another landing point in Ceuta, suggesting a focus on connectivity within the city.
- **Tarifa**: The southernmost point of mainland Spain, known for its proximity to the Strait of Gibraltar.
The cable's route appears to serve both mainland Spain and the autonomous city of Ceuta, which is geographically located on the African continent but politically part of Spain. This configuration highlights its role in linking these territories across the Strait of Gibraltar.
Why it was built and what it carries
The DOS CONTINENTES l & ll system was likely built to enhance connectivity between Spain's mainland and Ceuta, a region that could benefit from improved telecommunications infrastructure due to its unique geographical and administrative position. While the cable's specific data transmission capacity is not disclosed, it is reasonable to assume that it supports internet, voice, and other digital services for local users and businesses. Its short length and domestic focus suggest it may also serve as a backup or supplementary link to terrestrial networks in the region.
History: what can be established
The GeoCables database records the cable's ready-for-service year as 2020. Publicly available sources do not provide alternative dates, nor do they offer detailed insights into its construction or commissioning process. If industry sources suggest a different year, this has not been surfaced in the current dataset. The absence of documented milestones or announcements makes it difficult to trace the cable's development history beyond its operational status.
Capacity and technology
Key technical specifications of the DOS CONTINENTES l & ll cable, such as its design capacity, fiber pair count, and supplier, are not disclosed in public records. Without operator documentation, attributing these details would be speculative. The cable's short length and domestic route imply that it may not be designed for high-capacity international traffic but rather for localized connectivity needs.
Latency: the physics
Theoretical calculations suggest a one-way light propagation latency of approximately 0.5 milliseconds over the 95-kilometer wet segment. For round-trip transmission, the latency floor is approximately 0.9 milliseconds, assuming optimal conditions and light traveling at 200,000 to 204,000 km/s in fiber. However, real-world latency is invariably higher due to factors such as land tails, terminal equipment processing, and routing inefficiencies. No live measurements are currently available for this cable to validate its performance.
Redundancy: what happens if it breaks
Given its short length and domestic focus, the DOS CONTINENTES l & ll cable is likely part of a broader network that includes terrestrial links and other submarine systems in the region. If the cable were to experience a fault, redundancy could be provided by alternative infrastructure connecting Spain and Ceuta. Repair logistics would follow standard industry practices, involving cable ships equipped with specialized tools to locate and fix the fault. The relatively shallow waters of the Strait of Gibraltar may facilitate quicker repair operations compared to deep-sea cables.
Bottom line
- DOS CONTINENTES l & ll is a 95-kilometer submarine cable connecting southern Spain and Ceuta.
- Owned by GTD España, it was recorded as ready for service in 2020.
- Key technical details, including design capacity and fiber pairs, are not publicly disclosed.
- Its short length and domestic route suggest a focus on localized connectivity rather than international traffic.
- Theoretical latency is approximately 0.5 ms one-way, though real-world performance is higher.
- Redundancy is likely provided by terrestrial links and other regional systems.