collapsed rocky boulders fall down from sandstone rocks and landslide blocked forest path

adrenaline avalanche bank blocked bohemian border boulder canyon caution cesky clay clayey clayeysoil claystone cliff cliffs closed czech erosion europe european explaining fall fence forest formation gravel growing hruboskalske hruboskalsko landscape landslide large mountain mountains mud natural paradise pieces prachov prachovske protected raj republic reserve risk road rocks rocky sand sandstone sandstones skaly slide soil spruce stone target top tourism tourist tower travel tree valley vegetation view waste way zone