Definition of Seikan Tunnel in English:

Seikan Tunnel

proper noun

  • The world's longest underwater tunnel, linking the Japanese islands of Hokkaido and Honshu under the Tsungaru Strait. Completed in 1988, the tunnel is 51.7 km (32.3 miles) in length.

Pronunciation:

Seikan Tunnel

/ˈseɪkən/