The Natural Park of Serra de São Mamede, reclassified on 20th of May 2004, covers about half of the Site of Community Interest (SCI) associated with the mount of São Mamede.
It is an area of great diversity of habitats, especially important from a phytogeographic point of view, because the mountain of San Mamede is a very marked relief in a very extensive peneplain.
This physiographies feature promotes a set of microclimates that gives rise to a great diversity. Thus, in the south and on the eastern slopes, subjected to greater Mediterranean influence they are located xeric species, whereas in the northern and western zones, with abundant rainfall, species and Atlantic vegetation are distributed residual populations of heather and gorse higrófilos.
In the mountainous region, under the control of the central massif, there is a significant presence of forest production (eucalyptus and maritime pine) and are still visible patches of oak, cork oak and chestnut (mostly at the base of the slopes) and rock species and chasmophytic vegetation. It is a more intensely humanised area with medium sized properties where orchards occupy a considerable area.