Tunnel of Mauvages
The 220th longest tunnel in the world
The Tunnel of Mauvages is a river tunnel on the Marne–Rhine Canal. It is 4,877 meters long and was built from 1841 to 1846 near the city of Mauvages, Meuse department. The tunnel is equipped with a bipolar 600 volt overhead wire for electric vessels [1].
Tunnel data from Wikidata (CC0). Summary from Wikipedia (CC BY-SA).