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Tunnels of the World

Mount St. Gothard, 48,840 feet long (the longest in the world); Mount Cenis, 39,840 feet long; Hoosac, 25,080 feet long; Nochistongo, 21,659 feet long; Sutro, 21,120 feet long; Riquivel, 18,623 feet long; Nerthe, 15,153 feet long; Blaizy, 13,- 455 feet long; Thames and Medway, 11,880 feet long; Mersey, 42 miles long, including approaches; Severn, 22,992 feet long.