Nakayama Tunnel (Niigata Prefecture)

Nakayama Tunnel (Japanese: 中山隧道, Hepburn: Nakayama zuidō) is unused tunnel on National Route 291 in Niigata, Japan. It is located at between Naganuma and Uonuma. Its length is 922 m and this is longest hand‐cut tunnel in Japan.

It made in between 1933 and 1949 by residents in Komatsukura settlement (小松倉地区, Komatsukura chiku), old Yamakoshi Village. In 1998, new tunnel for vehicles was opened and old tunnel have been preserved as historic site. It is known that construction of new tunnel was involved with Kakuei Tanaka.

There is a documentary film named "Horumaika Tebori Nakayama-Zuido no Kiroku (掘るまいか 手掘り中山隧道の記録)" directed by Shinichi Hashimoto. It is designated on Civil Engineering Heritage Sites Selection by Japan Society of Civil Engineers in 2006.

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