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: bicycle touring
Road and gravel cycling loops from Flanders
Road and gravel cycling loops for the enthusiast cyclist
Routes based on the node points from Flanders
Cycle touring routes based on the node points (Fietsknooppunten).
Cycle highways
Cycle highways – a network of fast cycling routes present in Flanders and Brussels Region.
Cycling in Belgium 