Photo taken on Aug. 3, 2013 shows the Danxia landform in Zhangye, northwest China's Gansu Province. Zhangye opened the third tourism festival on Aug. 3, showcasing its landscape and culture. (Xinhua/Wang Jiang)

Photo taken on Aug. 1, 2013 shows the Danxia landform in Zhangye, northwest China's Gansu Province. Zhangye opened the third tourism festival on Aug. 3, showcasing its landscape and culture. (Xinhua/Wang Jiang)

Photo taken on Aug. 2, 2013 shows rape blossoms fields in Zhangye, northwest China's Gansu Province. Zhangye opened the third tourism festival on Aug. 3, showcasing its landscape and culture. (Xinhua/Wang Jiang)

Photo taken on Aug. 3, 2013 shows a wetland in Zhangye, northwest China's Gansu Province. Zhangye opened the third tourism festival on Aug. 3, showcasing its landscape and culture. (Xinhua/Wang Jiang)