SPOT
Seikan Tunnel
The Seikan Tunnel (53.85 km long, 240 m below sea level) began operations on March 13, 1988, and serves as a major artery connecting Hokkaido and Honshu.
Chonai-cho is the entrance to the Hokkaido side of the Seikan Tunnel.
Location
48-27 Yunosato, Chonai-cho, Kamiiso District, Hokkaido
The information is current as of March 2021.
Please check the official website for details.