VISITWallonia.be offers a collection of cycyling loops for MTB and touring bikes :
https://visitwallonia.be/fr-be/3/jaime/wallonie-a-velo/carte-des-balades-a-velo
Tag: Wallonia
RAVeL (Réseau Autonome des Voies Lentes)
RAVeL (Réseau Autonome des Voies Lentes) – a network of greenways from Wallonia that were built in place of ancient railway lines and towing paths along waterways.
Cycling in Belgium 