Nakayama Tunnel (中山トンネル, Nakayama tonneru) is a tunnel on JR East-Joetsu Shinkansen line in Japan that runs from Jomo Kogen, Takasaki city to Onoko, Shibukawa city, in Gunma prefecture with approximate length of 14.857 km.[1] It was completed and opened in 1982.[2][3]