Route submitted by Joseph Sutton:

Główny Szlak Sudecki is a public hiking trail in Poland running along the Sudetes. The trail was constructed after WWII and extended to about 444km in about 2009.

 https://mapa-turystyczna.pl/trail/glowny-szlak-sudecki-im-mieczyslawa-o…

as well information about route can be found on wikipedia: https://pl.wikipedia.org/wiki/G%C5%82%C3%B3wny_Szlak_Sudecki

https://en.wikipedia.org/wiki/Main_Beskid_Trail

The London Outer Orbital Path — more usually the "London LOOP" — is a 150-mile (242 km) signed walk along public footpaths,^[1] and through parks, woods and fields around the edge of Outer London

A 200km linear park along an old train line, from Mont-Laurier to Saint-Jérôme.  https://www.laurentides.com/en/linearpark