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The Grand Union is a 137 mile (220km), 166 lock, 2 tunnel canal running between Brentford in London and Birmingham. It is the longest canal in Britain, and has 11 main arms and junctions. It takes over a week to navigate.

The Leicester arm branches off at Norton Junction and runs 66 miles long through 59 locks (including 2 staircase locks at Foxton) and 2 tunnels to Leicester where it continues into the River Soar.

Read more at Wikipedia Link

This 20 mile long route spans the London Borough of Hillingdon from Cranford Park in the south to Springwell Lock on the Grand Union Canal in the north. The Celandine Route (12 miles) along the River Pinn from Pinner provides another link to the Grand Union Canal Walk at the junction of the Slough Arm.