steep and precipitous gully made of rocks and stones to reach the valley by following a tiring mountain path

pordoi sass pordoispitze dolomites dolomite sasso alps european mountain outdoor dolomiti mountains italy italian mount canyon gully scree stony stones stone gravel downhill descent cliff crag precipice inaccessible impervious valley dale valleys uphill ascent climb fassa trentino south tyrol val trento sudtirol