aerial top down view of omarama clay cliffs geological erosion silt and sand rock formation in canterbury new zealand

omarama clay cliffs rock formation canyon nature landscape zealand travel landmark south island mountain breathtaking bizarre stunning pinnacles tourism scenery vacation pillars geological erosion geology natural sandstone stone sand environment scenic climate change drone gravel reserve history ravine hills aerial outdoor ahuriri river paritea silt sediment gorge narrow top birds eye view canterbury