List of tunnels in the United Kingdom lists road, railway, waterway and some other forms of tunnel in the United Kingdom.
A tunnel is an underground passageway with no defined minimum length, though it may be considered to be at least twice as long as wide. Some civic planners define a tunnel as 0.1 miles (160 metres) in length or longer.
A tunnel may be for pedestrians or cyclists, for general road traffic, for motor vehicles only, for rail traffic, or for a canal. Some are aqueducts, constructed purely for carrying water—for consumption, for hydroelectric purposes or as sewers—while others carry other services such as telecommunications cables. There are even tunnels designed as wildlife crossings for European badgers and other endangered species.
The longest tunnel in the United Kingdom is the Thirlmere Aqueduct, an underground aqueduct which carries water from Thirlmere to Manchester. The aqueduct opened in 1894 and it remains the longest tunnel in the world at 95.7 miles long. The Standedge Tunnel at 5,029 metres (3.25 miles) is the longest canal tunnel in the United Kingdom.
Read more about List Of Tunnels In The United Kingdom: England, Wales, Scotland, Northern Ireland
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