is a tunnel on the Chūō Expressway (E19) in Japan that runs (through the Kiso Mountains) from Shimoina District, Nagano prefecture to Nakatsugawa City, Gifu prefecture with up-line length of 8.649 km and down-line length of 8.489 km. It was completed and opened in 1985.
See also List of tunnels in Japan Seikan Tunnel Tappi Shakō Line Sakhalin–Hokkaido Tunnel Bohai Strait tunnel
References
External links Gov. maps.gsi.go.jp
Enasan Tunnel between Nagano - Gifu prefecture Enasan Tunnel (wikimapia)