The mountain route leaves from the Laguna de los Peces parking lot, at the end point of the panoramic road that goes up from Puebla de Sanabria through San Martín de Castañeda. At the corner of the parking lot two paths begin, one wide on the right (east) that goes down towards the basin where the Fish Lagoon is, this is the return route, and another narrower path with worse surface on the left (north). ) marked with the milestones of the Mountain Path 7 From Peces to Peña Trevinca, which is the one-way route to the Tera glacial valley and the great mountain of Sanabria. The route of the lane is clear on the slope of Peña Cabrita, in the ditch of the path there are milestones of the route and the forest desolation that invades the mountain slopes allows us to contemplate the magnificent breadth of the Sierra Segundera mountains.