Karawanks Tunnel
The 142nd longest tunnel in the world
The Karawanks Tunnel (Karawankentunnel, Slovene: Predor Karavanke or Karavanški predor) is a motorway tunnel crossing the Alpine Karawanks mountain range between Austria and Slovenia, with a total length of 7,864 m (4.886 mi, 25, 801 ft), 8,019 m (4.983 mi, 26, 309 ft) enclosure between the portals. Its construction began in 1986 and it opened on 1 June 1991. It connects the Austrian Karawanken Autobahn (A11) from Villach with the A2 motorway leading to Kranj and Ljubljana in Slovenia, decongesting the historic Loibl/Ljubelj and Wurzen/Korensko sedlo mountain passes.
Tunnel data from Wikidata (CC0). Summary from Wikipedia (CC BY-SA).