a stone path with steps ascends the hill between the rocks.

undulating formation landscape redbrown national mountain landmark ascends bizarre passage geopark terrain geology cliffs slopes narrow forest stone steps rocks karst steep china hunan cliff path hill rock tree wall red weathered rocky path steps pathway passage stairway ascent rise stairs staircase cliffs bizarre carbonate stone unusual eroded unique wavy formation geologic unesco uneven impressive geopark uneven surface geological red rock geo park carbonate oxide spectacular erosion redstone landmark karst hunan hill hike geology footpath fenghuang cliff china attraction