the mata da albergaria, a well-preserved oak forest within peneda-gerês national park, northern portugal

acer albergaria balance biodiversity biogenetic biosphere braga castelo causeway conservation degradation ecosystem english forest geira geraordf laurel lusitanica maple mata milestones nacional national nature northwestern oak park parque peneda portugal portuguese prunus pseudoplatanus pyrenaica pyrenean quercus reserve robur roman romana ruins tree unesco via viana