Gorigamine Tunnel
The 52nd longest tunnel in the world
Gorigamine Tunnel (Gorigamine tonneru) is a tunnel on JR's Hokuriku Shinkansen that runs between Ueda city and Chikuma city in Nagano Prefecture with total length of 15.175 km. It was built and completed in 1997.
Tunnel data from Wikidata (CC0). Summary from Wikipedia (CC BY-SA).