A route of great naturalistic and landscape interest, it is based on the memory of the "trementinaires" women in the valley of the Vansa and Tuixent and their activity of collecting plants with medicinal properties that, once duly processed, were sold in a large part of Catalonia. The excursion begins at la Font del Mig, a fountain located in the village of Ossera. You have to take the path that takes you to the Arp mountain, and you will follow this signposted path to the Masies d'Ossera. It is a circular route around Ossera that passes through different habitats where you can find a wide variety of aromatic and medicinal plants, forests of pines, oaks, trees and shrubs for domestic use, with beautiful panoramic views of Ossera and the Valley of the Vansa.