Italian Monte Cenisio
Massif and pass, Alps .
Located in southeastern France west of Turin , Italy, the pass was an invasion route from earliest times and is traversed by a road 24 mi (38 km) long, built by Napoleon in 180310. The road climbs to Mount Cenis Pass (elevation 6,834 ft, or 2,083 m) and passes between two peaks more than 8,000 ft (2,500 m) high. The Mount Cenis railway tunnel, 8.5 mi (14 km) long, was the first great tunnel through the Alps (opened 1871). The road tunnel, 10 mi (16 km) long, opened in 1980.