Description : The Channel Tunnel is the longest rail tunnel in the world -Geography
Last Answer : The Gotthard Base Tunnel, with a length of 57.09 km (35.47 mi) and a total of 151.84 km (94.3 mi) of tunnels, shafts and passages, is the longest railway tunnel in the world, with a geodetic distance of 55.782 km (34.661 mi) between the two portals.