Somosierra (mountain pass)
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 116.
It has an altitude of 1,434 metres and is crossed by the A-1 (E5) road through a short tunnel; there is also a 3,895 metres long 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 this led to the battle between the Nationalist and Republican troops.
41°9′26.7″N 3°35′6.3″W / 41.157417°N 3.585083°W
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