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. Photo: Xinhua

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. Photo: Xinhua

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. Photo: Xinhua

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. Photo: Xinhua

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. Photo: Xinhua

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. Photo: Xinhua

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. Photo: Xinhua

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. Photo: Xinhua

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. Photo: Xinhua