hellental, germany - 07 30 2020: dam of oleftalsperre with some roadworks barrier

reservoir bridge waterway river walkway lake infrastructure water sea channel bay canal coast highway transport vacation shore dock vehicle oleftalsperre one big freshwater lakes west eifel close border belgium british called olef dam huge serves drinking supply flood prevention hellental wall power plant included ofn germany 2020: shoreline roadworks barrier eifel volcanic mountains volcano rolling landscape vulkaneifel volcanic hills idyllic resevoir dam wall lake water fresh water supply tourism