The term "canal tunnel" does not seem to be commonly applied to tunnels used to conduct water (for irrigation, water supply, etc.), such as the 48 km long Arpa-Sevan tunnel in Armenia (see List of longest tunnels in the world), or a number of tunnels on the Irtysh–Karamay–Ürümqi Canal in China.
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Location filming took place on the 20-mile stretch of the Grand Union Canal between Stoke Bruerne and Braunston in Northamptonshire, including the Blisworth Tunnel – at 1.75 miles (2.82 km) in length, the third-longest canal tunnel in Britain.