Shiozawa Tunnel
The 80th longest tunnel in the world
Shiozawa Tunnel (Shiozawa tonneru) is a tunnel on Jōetsu Shinkansen that runs from Yoshiri, Minamiuonuma city and Shiroyama shinden, Minamiuonuma city in Niigata Prefecture with total length of 11.217 km. It was built and completed in 1982.
Tunnel data from Wikidata (CC0). Summary from Wikipedia (CC BY-SA).