peneda-gerês national park in northern portugal

balance biodiversity biogenetic biosphere braga castelo collision continental deforestation degradation ecosystem europe fires forest formations geology geomorphological geomorphology geraordf granitic heath iberian landscape layers logging moors mountains nacional national nature northwestern oak outcrops overgrazing park parque peneda peninsula petrography portugal quartz quartzites quercus reserve rock rocks schist sedimentary silurian terrain tree unesco viana