群馬県渋川市の利根川沿いにある廃トンネル。 元々明治7年に開通した清六新道と呼ばれた道を、佐久発電所放水路工事の折に拡張したものだという。
A waste tunnel along the Tone River in Shibukawa City, Gunma Prefecture. It is said that the road originally called Kiyoku Shindo which was opened in the year of Meiji 7 was extended to the construction of the Saku Power Station drainage canal.