Around 100 hot air balloons fly over the renowned Danxia landform in Zhangye, Gansu province.(Photos provided to chinadaily.com.cn)

A hot air balloon flies above the Danxia landform in Zhangye, Gansu province on July 20.

Around 100 colorful hot air balloons fly over the Danxia landform in Zhangye, Gansu province.

A view from below of a hot air balloon.