verlobungsinsel in the river oker

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