The Capital Ring is a 75 mile walk around the outskirts of London. You can find more information from various sources:
And there is an overall map of the entire route.
I will be walking it in the usual clockwise direction, starting (and finishing!) in Richmond. This is not the official start/end, but is the closest to me.
01 – Richmond Bridge to Osterley Lock
02 – Osterley Lock to Greenford
03 – Greenford to South Kenton
04 – South Kenton to Hendon
05 – Hendon to Highgate
06 – Highgate to Stoke Newington
07 – Stoke Newington to Hackney Wick
08 – Hackney Wick to Beckton District Park
09 – Beckton District Park to Woolwich
10 – Woolwich Foot Tunnel to Falconwood
11 – Falconwood to Grove Park
12 – Grove Park to Crystal Palace
13 – Crystal Palace to Streatham
14 – Streatham to Wimbledon Park
15 – Wimbledon Park to Richmond Bridge