What is the longest tunnel in Europe?

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The world’s 4 longest vehicle tunnels and 5 of the 10 longest rail tunnels are in Europe; over ¼ of world’s railroad tracks are within Europe.

Here are some of the longest road tunnels in Europe:

  1. Lærdal Tunnel (Norway) - Length: 24.5 kilometers (15.2 miles)
  2. Gotthard Base Tunnel (Switzerland) - Length: 24.5 kilometers (15.2 miles)
  3. St. Gotthard Tunnel (Switzerland) - Length: 16.9 kilometers (10.5 miles)
  4. Fréjus Road Tunnel (France-Italy) - Length: 13.7 kilometers (8.5 miles)
  5. Tauerntunnel (Austria) - Length: 6.4 kilometers (4.0 miles)
  6. Maurienne Valley Road Tunnel (France) - Length: 12.9 kilometers (8.0 miles)
  7. Arlberg Road Tunnel (Austria) - Length: 13.9 kilometers (8.6 miles)
  8. Arlberg Railway Tunnel (Austria) - Length: 10.6 kilometers (6.6 miles)
  9. San Bernardino Tunnel (Switzerland) - Length: 6.6 kilometers (4.1 miles)
  10. Mont Blanc Tunnel (France-Italy) - Length: 11.6 kilometers (7.2 miles)

Here are the top 5 longest underwater tunnels in Europe:

  1. Channel Tunnel (Eurotunnel) - Length: Approximately 50.5 kilometers (31.4 miles)
    • Location: Connects Folkestone in the United Kingdom with Coquelles near Calais in France.
  2. Seikan Tunnel - Length: Approximately 53.85 kilometers (33.5 miles)
    • Location: Connects the islands of Honshu and Hokkaido in Japan. While primarily located in Japan, a small section of the tunnel is technically in European territory.
  3. Helsinki-Tallinn Tunnel (proposed) - Planned Length: Approximately 103 kilometers (64 miles)
    • Location: Planned to connect Helsinki, Finland, with Tallinn, Estonia, under the Gulf of Finland. As of my last update, this tunnel was in the planning stages and not yet constructed.
  4. Marmaray Tunnel - Length: Approximately 13.6 kilometers (8.5 miles)
    • Location: Connects the European and Asian sides of Istanbul, Turkey, beneath the Bosporus Strait.
  5. Bosporus Road Tunnel (planned) - Planned Length: Approximately 6.5 kilometers (4 miles)
    • Location: Proposed to connect the European and Asian sides of Istanbul, Turkey, beneath the Bosporus Strait. As of my last update, this tunnel was in the planning stages and not yet constructed.