Photo shows the brightly hued Danxia landform in Yulin, Shaanxi province. The unique rippled appearance is caused by layers of red sandstone that erode over time to form a series of curvaceous mountains, punctuated by the occasional unusual rock formation. The Danxia landform is a unique type of petrographic geomorphology. Photo: People's Daily Online

Photo shows the brightly hued Danxia landform in Yulin, Shaanxi province. The unique rippled appearance is caused by layers of red sandstone that erode over time to form a series of curvaceous mountains, punctuated by the occasional unusual rock formation. The Danxia landform is a unique type of petrographic geomorphology. Photo: People's Daily Online

Photo shows the brightly hued Danxia landform in Yulin, Shaanxi province. The unique rippled appearance is caused by layers of red sandstone that erode over time to form a series of curvaceous mountains, punctuated by the occasional unusual rock formation. The Danxia landform is a unique type of petrographic geomorphology. Photo: People's Daily Online

Photo shows the brightly hued Danxia landform in Yulin, Shaanxi province. The unique rippled appearance is caused by layers of red sandstone that erode over time to form a series of curvaceous mountains, punctuated by the occasional unusual rock formation. The Danxia landform is a unique type of petrographic geomorphology. Photo: People's Daily Online

Photo shows the brightly hued Danxia landform in Yulin, Shaanxi province. The unique rippled appearance is caused by layers of red sandstone that erode over time to form a series of curvaceous mountains, punctuated by the occasional unusual rock formation. The Danxia landform is a unique type of petrographic geomorphology. Photo: People's Daily Online