Somosierra (mountain pass)

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Somosierra is a mountain pass in the Sierra de Guadarrama north of Madrid in Spain. It connects the north of the Community of Madrid with the east of the province of Segovia. Just south of the pass is the municipality of Somosierra with a population of 77.

Somosierra Pass today

It has an altitude of 1,434 metres (4,705 ft) and is crossed by the A-1 (E5) road through a short tunnel; there is also a 3.9-kilometre-long (2.4 mi) rail tunnel. Near the summit the Spanish authorities provide an unmonitored rest stop aimed at Arab migrant workers driving to France, to discourage them from simply stopping at the side of the road.


The road was originally a track opened up by Napoleon to provide a direct route to Madrid. In 1808 this led to the Battle of Somosierra between French-Polish and Spanish forces.

In 1936, at the beginning of the Spanish Civil War, the Battle of Somosierra (1936) took place in the heights of the pass between Carlist and Falangist units and Spanish Republican Army troops.[1]


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Coordinates: 41°8′6″N 3°34′52″W / 41.13500°N 3.58111°W / 41.13500; -3.58111