Tourists visit the Hongshi Gorge in the Yuntai Mountain scenic area in Xiuwu County of Jiaozuo, central China's Henan Province, June 16, 2018. The 1.5-kilometer-long Danxia landform gorge characterizes by reddish sandstone features. (Xinhua/Feng Dapeng)

Tourists visit the Hongshi Gorge in the Yuntai Mountain scenic area in Xiuwu County of Jiaozuo, central China's Henan Province, June 16, 2018. The 1.5-kilometer-long Danxia landform gorge characterizes by reddish sandstone features. (Xinhua/Feng Dapeng)

Photo taken on June 16, 2018 shows the Hongshi Gorge in the Yuntai Mountain scenic area in Xiuwu County of Jiaozuo, central China's Henan Province. The 1.5-kilometer-long Danxia landform gorge characterizes by reddish sandstone features. (Xinhua/Li Renzi)

Tourists visit the Hongshi Gorge in the Yuntai Mountain scenic area in Xiuwu County of Jiaozuo, central China's Henan Province, June 16, 2018. The 1.5-kilometer-long Danxia landform gorge characterizes by reddish sandstone features. (Xinhua/Feng Dapeng)

Tourists visit the Hongshi Gorge in the Yuntai Mountain scenic area in Xiuwu County of Jiaozuo, central China's Henan Province, June 16, 2018. The 1.5-kilometer-long Danxia landform gorge characterizes by reddish sandstone features. (Xinhua/Feng Dapeng)

Photo taken on June 16, 2018 shows the Hongshi Gorge in the Yuntai Mountain scenic area in Xiuwu County of Jiaozuo, central China's Henan Province. The 1.5-kilometer-long Danxia landform gorge characterizes by reddish sandstone features. (Xinhua/Li Renzi)(mcg)

Photo taken on June 16, 2018 shows the Hongshi Gorge in the Yuntai Mountain scenic area in Xiuwu County of Jiaozuo, central China's Henan Province. The 1.5-kilometer-long Danxia landform gorge characterizes by reddish sandstone features. (Xinhua/Li Renzi)(mcg)

Tourists pose for a selfie at the Hongshi Gorge in the Yuntai Mountain scenic area in Xiuwu County of Jiaozuo, central China's Henan Province, June 16, 2018. The 1.5-kilometer-long Danxia landform gorge characterizes by reddish sandstone features. (Xinhua/Li Renzi)(mcg)

Tourists visit the Hongshi Gorge in the Yuntai Mountain scenic area in Xiuwu County of Jiaozuo, central China's Henan Province, June 16, 2018. The 1.5-kilometer-long Danxia landform gorge characterizes by reddish sandstone features. (Xinhua/Li Renzi)(mcg)

Photo taken on June 16, 2018 shows the Hongshi Gorge in the Yuntai Mountain scenic area in Xiuwu County of Jiaozuo, central China's Henan Province. The 1.5-kilometer-long Danxia landform gorge characterizes by reddish sandstone features. (Xinhua/Feng Dapeng)(mcg)