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The Channel Tunnel (French: le tunnel sous la Manche) is a 31 mile (50.5 km)-long rail tunnel beneath the English Channel at the Straits of Dover, connecting Folkestone, Kent in England to Coquelles near Calais in northern France. A long-standing and very expensive megaproject that saw several false starts, it was finally completed in 1994. It is the second-longest rail tunnel in the world, with the Seikan Tunnel in Japan being longer, but the undersea section of 24 miles (39 km) is the longest in the world. It is operated by Eurotunnel. Before and during construction it was widely known by the nickname Chunnel, but today it is normally known as the Channel Tunnel.