portuguese coast in benagil, algarve, portugal. peninsula. seven hangging valleys trail

portuguese calcareous peninsula suspensos landscape coastline carvoeiro limestone shoreline portugal hangging percurso atlantic seashore benagil algarve valleys hanging geology erosion nature travel europe eroded pillar carved rugged coast seven trail vales cliff beach ocean shore caves lagoa notch islet sete arch hole cave rock sand hike wave crag dos sky sea