The Peterborough Green wheel is a mixture of cycleways, quiet country roads and flatten gravel paths. It is mostly marked cycle way route 21/12.
https://www.pect.org.uk/projects/green-wheel/?gclid=EAIaIQobChMI6s2jyvHc6gIV0cDACh1xhAGjEAAYASAAEgIlF_D_BwE
I started in Eye as it is furthest from Ferry Meadows which has the only toilets/water during daylight hours and headed clockwise. 

Traditional route from the lake of Baños de Panticosa, to the emblematic Garmo Negro (3064msn), emblematic mountain of the Pyrenees mountain range (Huesca, Spain).

The route runs near the Argualas waterfalls and climbs the Garmo channel to face its final peak with an inclination of 60%.

*1) Between Jawor and Jelenia Góra in Lower Silesia, in the region of the Kaczawskie Mountains and Foothills, there is the Land of Extinct Volcanoes - one of the most geologically and tectonically diverse areas in Poland.
They are log mountains with sunken ditches and raised logs. The oldest rocks that make up the Kaczawskie Mountains come from the Cambrian and are over 500 million years old. The volcanic landscape of the Kaczawskie Foothills can be admired thanks to the presence of basalt hills of former volcanoes.

This is one of the most scenic and popular coastal walks in the Uk leaving from Brighton to Eastbourne. It takes in the end of the South Downs Way across the spectacular seven sisters white cliffs. A cracking marathon across multiple terrains with some elevation and the sea always in view