Iwate-Ichinohe Tunnel
The 25th longest tunnel in the world
The Iwate-Ichinohe Tunnel (Iwate-Ichinohe Ton’neru) is a 25.81 km terrestrial railway tunnel in Japan — part of the Tōhoku Shinkansen, linking Tokyo with Aomori. When opened in 2002 it was the longest in-use terrestrial (land based) tunnel in world, but the title was overtaken by the Lötschberg Base Tunnel in June 2007.
Tunnel data from Wikidata (CC0). Summary from Wikipedia (CC BY-SA).