rough cliff in mullerthal, luxembourg

rock geology terrain boulder formation cliff bedrock soil tree stonewall badlands ridge plant sculpture mountain wadi trunk art park bench low mullerthal luxembourg rural region east canton echternach spectacular geological cliffs walk forest area located sauertal berdorf waldbillig hiking trails build offer ways explore rough luxemburg lux grand duchy europe waldbalaquo lleg kanton mafrac14 llerthal erosion edge stone crumbling control eroded root plants earth landslide