Linea P map

See the map

The project

The Línea P map is a project whose objective is to identify the bunkers built from 1936 in the Pyrenees. From 2015 to 2022, the map was a collaborative project where anyone could add the bunkers they discovered!

Click on a bunker on the map to see its photos.

What is the use of the Línea P map?

To organize themed hikes in the Pyrenees
These unusual bunkers can become the goal of walks or mountain circuits! They can motivate children (and older ones) on the theme of a treasure hunt or an observation game...

To promote urban exploration tourism (urbex)
By promoting these unusual monuments, Línea P map makes it possible to create a new tourist activity (bunkerology) in all the territories of the Pyrenees.

To preserve the memory of Pyrenean history
By listing all the bunkers, this map elevates the entire system to the rank of a monument and allows us to understand what these concrete blocks camouflaged in the middle of the mountains are. It highlights this magnificent heritage of military architecture (humans are generally inspired when it comes to beating on it).

To understand the overall strategy of the system
The map, comments and photos will allow to fully understand the layout plan decided by the Spanish strategists.

Line P cannon bunkers at the Vielha Tunnel
GPS 42.62423,0.76656

The Línea P

The P Line, sometimes called the Pyrenees Defense Organization or the Gutierrez Line, is a set of defensive bunkers (military fortifications resistant to enemy fire) built in secret under the regime of dictator Francisco Franco. It was mainly intended to prevent the Allies from entering Spain. Using the 500 km natural barrier formed by the Pyrenees, it has an impressive number of bunkers: the map currently counts 2,842 bunkers of Línea P, including 1,750 verified and 1,092 very likely. The highest bunker is 2,507 m above sea level (GPS 42.43958, 1.56357).

It is made up of semi-buried reinforced concrete bunkers, sometimes connected to each other by tunnels. These bunkers are distributed in Centers of Resistance (CR), themselves classified according to the level of risk (the maps of CR found in books or on the internet do not correspond to reality). It was less well protected than other constructions of the time, even obsolete. Many Línea P bunkers are in forests that did not exist when they were built. Until Franco's death in 1975, it was a military secret. If you talked about it too much, you were in trouble... It was definitively abandoned in the 1980s.

Sperrlinie Pyranäenfront

On the French side, the Germans also built a line of blockhouses in 1944, the Sperrlinie Pyranäenfront. Indeed, they feared that Spain would go over to the side of the Allies. It would have had about forty bunkers, mainly half-buried tank turrets. As with the Atlantic Wall, these bunkers are standardized.

bunker pirineus
GPS 43.03623,-1.47202
bunker pirineus
GPS 43.06045,-1.4828
bunker pirineus
GPS 43.04792,-1.49508
bunker pirineus
GPS 43.21989,-1.5074
bunker pirineus
GPS 42.62405,0.76623
bunker pirineus
GPS 42.62423,0.76656
bunker pirineus
GPS 42.63708, 0.79648
bunker pirineus
42.37547,1.6707 / 42.35888,1.67986
bunker pirineus
GPS 42.35668,1.68412
bunker pirineus
GPS 42.35105,2.88748
bunker pirineus
GPS 42.43533,3.16047
bunker pirineus
GPS 42.23676,3.21697


Types de bunkers

Line P bunkers are all different, but these types of bunkers are almost always found. The bunkers were never armed, but they were intended to use the following armaments:

Bunker for automatic rifle
Fusil ametrallador Oviedo 7,92mm
And possibly OC Modelo 1937 7 mm

Bunker for machine gun
Hotchkiss modèle 1914 7,92 mm
And possibly ZB vz. 37 7,92 mm et Alfa 44 7,92 mm

Bunker for anti-tank gun
PaK 40 75 mm
Placencia 60/45 60 mm

Shelter for anti-tank gun
Garage for cannon and ammunition serving an open-air shooting platform (barbette), probably built before the Línea P.

Bunker for anti-aircraft machine gun
Oerlikon 20 mm

Bunker for mortar
Valero 81 mm modelo 1933
Valero 50 mm modelo 1932

Observatory bunker
Observation bunker, often with a room (for telephone transmissions for example).

Shelter bunker
3 parallel tunnels, sometimes connected to each other.

The walls and ceilings would be 75 cm thick. Armored doors were planned to close the bunkers, they were sometimes made, but very rarely installed. Some foundations of unbuilt bunkers have been dug (they are not shown on the map). Drains prevent the bunkers from being flooded.


  • A powerful flashlight is essential to enter bunkers. A helmet is recommended.
  • Check where you are stepping, falls are always possible, especially in manholes...
  • Gardening tools can be used to clear the entrance to the most overgrown bunkers.
  • Like all abandoned places, bunkers can contain a lot of trash.
  • Some bunkers are on private property.
  • Some bunkers are home to adorable bats that are harmless if you leave them alone (their bite can transmit rabies).


You want:
  • Provide us with the GPS coordinates of a bunker
  • Make a correction
  • Access map modification
  • Send us an article about the Línea P
  • Improve the translation

Contact me!

Mother tongue: French | Languages understood: Spanish, English

Carte de la Línea P is a voluntary non-profit collaborative project.