Mountain pass, Lepontine Alps , southern Switzerland.
An important motor and railway route between central Europe and Italy, the pass lies at an elevation of 6,916 ft (2,108 m) and is 16 mi (26 km) long. Though the pass was known to the Romans, it was not generally used until the early 13th century. A long, winding motorway leads across the pass, and the St. Gotthard Tunnel extends for more than 9 mi (14 km) beneath it. The railway through the tunnel connects Lucerne with Milan .