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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

The Capital Ring is a surprisingly green route that encircles London. Distance is 78miles; it threads together parks and open spaces, mostly following pleasant residential roads in between. The route is an initiative of the London Walking Forum. The route is very well signed, with a Big Ben logo TQ1678 : Three walk logos, Gallows Bridge. The route is a walker’s equivalent of the North and South Circular roads. Link