The trail G 303A closes a ring with the G 303 trail from which it branches off just before the entrance to the Badu Onu rest area.
The first half of the trail goes into the holm oak and cork oak forest in a stretch completely shaded by vegetation. Once the trail reaches the forestry path, it crosses and walks along the fence dedicated to the habitat of the species subject to repopulation. It is therefore easy to observe animals, such as deer or mouflons waiting to be released. The trail then rejoins the G 303 trail just a few hundred meters after the forest station from which it continues uphill to Monte Sas Crabas or return to the Badu Onu rest area.