Rue des phosphate - Approx 15 minutes from station.
Here you will find lots of different trails to follow through a forest. Big gravel / dirt path all the way around. Free parking. Look for a walking sign on the side of the road, head down the track and park up.
Chaussée du Roeulx, Mons, Walloon Region 8.9"N 4°00'40.7"E