東隧道は新潟県長岡市（旧・山古志村）にある廃隧道。昭和9年竣工。 全長134m、幅1.8m、高さ1.8mと非常に狭い人道隧道で、雪中隧道および通学路として掘られたらしい。 現在は途中で崩落し、通行止めになっている。
Higashi Bunkaido is a waste tunnel located in Nagaoka city (formerly Yamakoshimura) in Niigata Prefecture. Completion in 1964. It seems that it was dug as a snowy tunnel and a school road in a very narrow humanitarian tunnel with a total length of 134 m, a width of 1.8 m, and a height of 1.8 m. Currently it collapses along the way and is closed to traffic.