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

accident adrenaline alert avalanche bank blocked border boulder broken canyon caution cesky clay clayey clayeysoil claystone cliff cliffs closed coastline collapse collapsed crag crash creek danger debris demolished destroyed entry erosion europe explaining fall fence forest formation gravel growing hruboskalske killing landmark landscape landslide large mountain mountains mud natural not pieces prachovske protected raj reserve risk road rock rocky sand sandstone skaly slide soil spruce top tourism tower travel tree turnov valley vegetation view waste way zone