Route: Główny Szlak Sudecki (Poland)

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-orlowicza-tf#50.55744/16.38336/9

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