We leave from Orosei before to start driving off-road to descend in the valley where the path begins. We start the hike wading the Flumineddu river to enter in the woodland formed by Olm oaks and Mediterranean scrub. Walking along the cliffs of Mount Oddeu we get the entrance of the Gorroppu canyon in less than 2 hours. You will be astonished walking by the rocky walls which rise for more than 400 meters over the river bed, the Gorrupu canyon is one of the deepest canyons in Europe!!! During the trekking you will discover the unique microclimate of the canyon that allowed the giant growth of some trees like the Phyllirea and the old Yew tree; there is besides an endemic grass, the Acquilegia di Gorropu, present in very few individuals inside the canyon. When the path becomes more rough the hike become harder, sometimes you have to use the hands to proceed through the boulders then, when it is no longer possible to go further, we get back on our steps.