The northpatagonic forests of the Aisen meridional region (44 degrees-48 degrees S) have suffered huge fires between 1936 and 1952. These fires have been produced by pioneers and stockman that burned the native vegetation in order to live in the prairie. Because of that, the forest was reduced in 37% in that period. After half a century of produced this impact, the burned ecosystem be-ins to regenerate with difficulty because of the nowadays human interventions and due to mass movements in the Andean mountain that remove important areas of forest. A case stud is presented, the valley of the Figueroa River, in an intermountain northpatagonic basin, located to the north of the Aisen region. In this area, the past and recent fires forests along with the erosion derived from the clearance of forest for logs and wood. For these reasons, the Nothofagus forests and conifers do not reach to recompose the original forest fa landscape.