oleftalsperre dam wall and fjord like sidearm of the reservoir

lake reservoir water reflection river tree mountain pond wilderness nature fjord waterway landscape sea shore bay tarn oleftalsperre like sidearm one big freshwater lakes west eifel close border belgium british called olef dam huge serves drinking supply flood prevention hellental wall power plant included eifel volcanic mountains volcano rolling landscape vulkaneifel volcanic hills idyllic fresh water reserve reservoir lake blud water nature blue dam wall cone