river guadiana at the pulo do lobo waterfall and the remnants of old aqueduck. alentejo, portugal

waterfall pulo do lobo guadiana portugal alentejo architecture bank blue sky cascata construction country current flow geologic hill landmark landscape mountain natural nature nobody old park portuguese rapids region river rocks slope stone stream valley vegetation water cascades limestone narrow gorge aqueduct remnants roman schist greenschists metamorphic serpentine gully