Zao Tunnel
The 81st longest tunnel in the world
Zao Tunnel (Zao tonneru) is a tunnel on Tōhoku Shinkansen that runs from Yamazakiarasawa, Kunimi town, Date district in Fukushima prefecture to Saikawa-Kajikawa, Shiroishi City in Miyagi Prefecture with total length of 11.215 km. It was built and completed in 1982.
Tunnel data from Wikidata (CC0). Summary from Wikipedia (CC BY-SA).