Danxia landform is seen at a geopark near Zhangye, northwest China's
Gansu Province, April 11, 2011. Danxia, which means "rosy cloud," is
a special landform formed from reddish sandstone that has been eroded
over time into a series of mountains surrounded by curvaceous cliffs
and many unusual rock formations. (Xinhua/Gao Jianjun)