This route starts near the french-belgian border and takes you on a unique route along the sea and the beach, through "mountain and dale" and through marvellous nature parks.
The north sea coast in Flanders has an almost uninterrupted sandbeach of more than 60 kilomters. These beaches belong to the most beautiful of Europe. The Grand Route-path called "Coastal Route" (Kustroute) follows a big part of the coast line from De Panne through to Wenduine. Many monumental sights are connected through this route. This journey spans over 58km with 342m of vertical gain, through which dunes, forests, thicket, beaches and dikes follow each other in quick succession.
The route can be easily followed by the signage of white/red signs that mark all GR (Grand Routes) that run through Europe. This is a part of the legendary GR5 that runs from the top of holland through the south of france.
You can find more info here : https://wandelen.groteroutepaden.be/en/wandelroutes/gr-netwerk/gr5a-kustroute and
here : http://www.trekkings.be/kustroute.html