It measures more than 8 kilometres and crosses the Pyrenees: the longest tunnel in Spain is in Aragon

Spain has an impressive network of infrastructures that facilitate communication between different regions. Among them, there is a tunnel that is over eight kilometres long and has become the longest in the country. This engineering work crosses the Pyrenees and connects Spain with France , being a key step for the transport of people and goods.

This construction is located in Aragon and is one of the most important in the road network in the north of the country. Its length makes it a reference point in terms of road tunnels, being an essential route for travellers crossing the border between both countries.

The tunnel that holds this record is the Somport tunnel, an infrastructure that links Spain and France through the Pyrenees. With a total length of 8,608 metres , it is considered the longest road tunnel in Spain . It was opened in 2003 and since then it has facilitated transit between the two countries, improving connectivity and reducing travel time.

THE SOMPORT TUNNEL, THE LONGEST IN SPAIN

The Somport tunnel has established itself as the most extensive underground road infrastructure in the country. Its importance lies not only in its length, but also in the role it plays in the cross-border transport network. Before its opening, the connection between Aragon and France was via the Somport mountain pass, a route that was particularly complicated in winter due to adverse weather conditions.

Thanks to this tunnel, communication between Spain and France has improved significantly. Its construction represented a major advance in terms of safety and efficiency , saving drivers from having to drive across high mountain roads. In addition, it has state-of-the-art ventilation, lighting and security systems to ensure smooth and safe traffic.

A TUNNEL THAT BEGINS IN SPAIN AND ENDS IN FRANCE

The Somport tunnel begins in the province of Huesca , in Aragon, and ends in the region of Nouvelle-Aquitaine, in France. It is a key infrastructure within the international corridor that links Zaragoza with Pau . This underground passage is used by both passenger cars and freight vehicles, making it a strategic route for trade between the two countries.

In addition to its importance for vehicle traffic, this tunnel is a safer alternative to traditional mountain passes. Its layout allows for constant traffic without the risks associated with extreme weather conditions , which is essential to ensure the connection between Spain and France throughout the year.

THE LONGEST TUNNELS IN SPAIN

In addition to the Somport tunnel, Spain has some of the most impressive tunnels in Europe, both in terms of rail and road infrastructure. The Guadarrama railway tunnel , with a length of 28.4 kilometres, is the longest in the country and a key element in the high-speed connection between Madrid and Valladolid .

In the urban area, the Serrano tunnel in Madrid, with 3.8 kilometres, is the longest underground tunnel in a Spanish city, optimising traffic in one of the busiest areas of the capital. In addition, the Viella tunnel , with 5.2 kilometres, is essential for the connection between Catalonia and Aragon, guaranteeing access to the Aran Valley region at any time of the year. These infrastructures not only improve connectivity and reduce travel times, but also contribute to road safety and the economic development of the regions they pass through.