forest pathway along the river

along alvarenga areinho arouca autumn aveiro biology country countryside downhills espiunca europe european flora footpath forest forests geological geology geopark green heritage hike hill landmark landscape landscapes mountains natural nature outdoor outdoors outside paiva park passadicos path pathway pathways place portugal province region river rivers riverside road route rural scene scenic side summer sunlight touristic trail trails travel traveling travelling tree trees trip unesco valley vau vegetation view walk walkways water way wild winter wood