GR routes (Grande Randonnée) are a network of long-distance hiking trail mostly in France, Spain, Belgium and the Netherlands. Many Caminos follow GRs. GR-121 goes along Northern Spain and follows the Norte or provides alternative routes, usually closer to the ocean.
Caminos go in only one direction. It is hard to go backwards because you have to look back to see the signs. GRs go in both directions and are signed for both.
Niki?
Thanks for catching the typo, Henry. I’ve been proofreading Charlie’s post but I missed that one. He meant to say “hiking.” We fixed it.