It has an altitude of 1,434 metres (4,705 ft) and is crossed by the A-1 (E5) road through Túnel Juan Manuel Morón Garcia, a short twin-bore tunnel named in honour of a civil engineer who worked on the Spanish motorway network. There is also a 3.9-kilometre-long (2.4 mi) rail tunnel.
History
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.