is a tunnel on JR's Hokuriku Shinkansen located between Takasaki city (Gunma Prefecture) and Karuizawa town in Nagano Prefecture with total length of 8.295 km. It was built and completed in 1997.https://english.shield-method.gr.jp/wp/wp-content/uploads/ecl_02.pdf Akima Tunnel
See also List of tunnels in Japan Seikan Tunnel undersea tunnel between Honshu-Hokkaido islands Kanmon Railway Tunnel undersea tunnel between Honshu-Kyushu islands Sakhalin–Hokkaido Tunnel Bohai Strait tunnel
References
External links Gov. maps.gsi.go.jp Yahoo maps of Akima tunnel Mapion site Akima tunnel from jst.go.jp government website 秋間トンネル