This gravel marathon guides you through the green lung of Brussels. Initially you will cross the beautiful beech cathedral of the Sonian Forest. From one roller coaster to another. A perfect flow almost everywhere. Barely any asphalt to be seen. You will also be introduced to the beauty of the Hallerbos. What colours! What scents! And what jobs! Without exaggerating: the gravel paradise is located close to the capital of Belgium. Choose from 60, 100 or 150 kilometers of pure enjoyment.