also known by the portmanteau Chunnel, is a 50.5 km undersea rail tunnel linking Folkestone, Kent in England with Coquelles near Calais in northern France beneath the English Channel at the Strait of Dover. At its lowest point it is 75 m deep.It has the longest undersea portion of any tunnel in the world, although Japan's Seikan Tunnel is longer overall at 53.85 km (33.5 mi) and reaches a depth of 240 m .
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