Senzan Tunnel
The 205th longest tunnel in the world
Senzan Tunnel (Senzan Ton'neru) is a tunnel on Senzan Line in Japan that runs from Taihaku Ward, Sendai city, Miyagi prefecture to Yamagata city, Yamagata prefecture with approximate length of 5.361 km. It was completed and opened in 1937.
Tunnel data from Wikidata (CC0). Summary from Wikipedia (CC BY-SA).