Here in Leicester we are circled by a 102 mile route, The Leicestershire Round. It was developed a few years ago as a project to link footpaths, bridalways and green roads to give one continuous route around the county.
https://leicestershirefootpaths.wordpress.com/the-leicestershire-round/
http://www.gps-routes.co.uk/routes/home.nsf/openmap?openform&route=leicestershire-round-walking-route
@Lullabelle and I have set ourselves a target of walking the entire route in a series of circular walks up to about 10 miles each. So far we've done about a third of it (though it has stalled a little of late)
https://leicestershirefootpaths.wordpress.com/the-leicestershire-round/
http://www.gps-routes.co.uk/routes/home.nsf/openmap?openform&route=leicestershire-round-walking-route
@Lullabelle and I have set ourselves a target of walking the entire route in a series of circular walks up to about 10 miles each. So far we've done about a third of it (though it has stalled a little of late)