The GR 57 or Vallée de l'Ourthe et Sentier du nord is a GR footpath between Belgium and Luxembourg. About 265 km long, it goes through four regions:
The city and surroundings of Liège The valley of the Ourthe The Sûre and the basin of the Rhine The Oesling and Gutland
Route Veille Foulerie (Barchon), Jupille, Liège, Angleur, Tilff, Esneux, Comblain-au-Pont, Durbuy, Hotton, La Roche-en-Ardenne, Houffalize, Gouvy, Troisvierges, Clervaux, Kautenbach, Lipperscheid, Diekirch.
External links https://web.archive.org/web/20050404182428/http://www.groteroutepaden.be/grlf/gr/routes/gr57.htm (in Dutch) Les Sentiers de Grande Randonnée, GR57 (in French)