foggy landscape in the harz

altenau artificial autmnal autumn autumnal barrage clouds cloudy color current dam deep drain flow fluid fog forest forests germany goslar group harz harzwasserwerke haze intake lake landkreis landscape landscapes landschaftsschutzgebiet leaf leaves lower mist nature naturpark niedersachsen northern oberharz oker okerstausee okertal okertalsperre photo photography reservoir river romkerhalle saxony schulenberg season system tree trees woodland