

Passage near a secret stream, also called the Bola, with capricious meanders and sometimes underground course.
Follow the signage "Purple diamond" (see photo above). Details of the walk on https://www.visorando.com/randonnee-la-vallee-de-la-hazienne-olne-vaux-froid/
Find the route on the map of walks in the municipality of Olne: https://www.paysdeherve.be/produit/olne-11-promenades-balisees
Not recognised (before 1996, exempt)