hellental, germany - 07 30 2020: dam road of oleftalsperreith a blocked side

bridge road highway infrastructure transport lane freeway track walkway overpass waterway asphalt reservoir vehicle railway river hellental germany 2020: drian hole cover top oleftalsperre dam one big freshwater lakes west eifel close border belgium british called olef huge serves drinking water supply flood prevention wall power plant included oleftalsperreith blocked side belgium dam wall