数坂隧道は群馬県沼田市にあった隧道。 明治27年9月に開通を予定していたが、完成直前に落盤事故が発生、そのまま放棄された。 半ば土に埋もれた煉瓦製の坑口が山中に残る。
Numasezaka Tunway is a tunnel that was in Numata city, Gumma prefecture. Although it was scheduled to open in September 1879, a falling accident occurred just before completion, it was abandoned as it was. A brick-made well headlock buried in mid soil remains in the mountains.