Topoguide from the "Grande Randonnée" Collection to discover the GR120 from Flanders to the Bay of Somme with its many exceptional natural sites: Authie Bay, Écault Dunes, and the Oye Platier.
The GR® 120 route begins in Belgium from the seaside town of La Panne.
It continues along the coast in Pas-de-Calais, revealing the treasures of the Opal Coast: the Oye Platier Nature Reserve, Wissant Bay, the port city of Boulogne-sur-Mer, and the Écault Dunes.
For lovers of wide-open, unspoiled natural spaces, the route leads hikers to Authie Bay, where flora and fauna flourish.
The GR® 120 ends in Tréport in Seine-Maritime, a seaside resort with a lively fishing port.