trail in green forest with falling water of barroca de degraínhos river in fraga da pena, arganil portugal

trail green forest falling water barroca degraínhos river fraga pena arganil portugal wooden fence vegetation footpath forest water falling cascade hiking backpacking trail fence wood wooden environment creek outdoor stream river purity vegetation trees natural wilderness destination travel nature mossy moss stones reflection landscape bridge degrainhos barroca rocks coimbra vacation touristic tourism europe arganil benfeita pardieiros margaraça aç serra range mata pena fraga portuguese