The Channel Tunnel
(French: Le tunnel sous la Manche
; also nicknamed the Chunnel
) is a 50.45-kilometre (31.35 mi) rail tunnel linking Folkestone, Kent, in England, with Coquelles, Pas-de-Calais, near Calais in northern France, beneath the English Channel at the Strait of Dover. It is the only fixed link between the island of Great Britain and the European mainland. At its lowest point, it is 75 m (250 ft) deep below the sea bed and 115 m (380 ft) below sea level. At 37.9 kilometres (23.5 mi), the tunnel has the longest underwater section of any tunnel in the world. The speed limit for trains through the tunnel is 160 kilometres per hour (99 mph).