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The River Brent rises in Barnet and flows southwards to meet the River Thames at Brentford, a distance of 17 miles. The lower part of the river, from Hanwell is part of the Grand Union Canal.
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

A 6 mile walk from Hanger Lane to Brentford, following the course of the River Brent. The Walk passes through the Brent River Park, a green corridor through west London.
Logo:TQ1678 : Three walk logos, Gallows Bridge