Around 100 hot air balloons fly over the renowned Danxia landform in Zhangye, Gansu province.[Photo provided to chinadaily.com.cn]

　　The first Zhangye (China) Colorful Danxia Hot Air Balloon Festival was held from Friday to Saturday in Zhangye, Northwest China's Gansu province.

　　The two-day event took place at the Zhangye Colorful Danxia Scenic Spot, the only area in the world with what is known as the Danxia landform and colorful hills. The area enjoys a great reputation, including a spot as one of the world's 10 magical geographical wonders, one of the world's most impressive 22 vistas and the world's most beautiful Danxia landform.

　　Danxia landform refers to various landscapes found in southeast, southwest and northwest China that consist of a red surface and steep cliffs.