Photo taken on Dec. 17, 2019 shows a view at the Maoxiang canyon in Zhidan County, northwest China's Shaanxi Province. The canyon consists of 9 segments with a total length of 12 kilometers. (Xinhua/Tao Ming)

Photo taken on Dec. 17, 2019 shows a view at the Maoxiang canyon in Zhidan County, northwest China's Shaanxi Province. The canyon consists of 9 segments with a total length of 12 kilometers. (Xinhua/Tao Ming)

Photo taken on Dec. 17, 2019 shows a view at the Maoxiang canyon in Zhidan County, northwest China's Shaanxi Province. The canyon consists of 9 segments with a total length of 12 kilometers. (Xinhua/Tao Ming)

Photo taken on Dec. 17, 2019 shows a view at the Maoxiang canyon in Zhidan County, northwest China's Shaanxi Province. The canyon consists of 9 segments with a total length of 12 kilometers. (Xinhua/Tao Ming)

Photo taken on Dec. 17, 2019 shows a view at the Maoxiang canyon in Zhidan County, northwest China's Shaanxi Province. The canyon consists of 9 segments with a total length of 12 kilometers. (Xinhua/Tao Ming)

Photo taken on Dec. 17, 2019 shows a view at the Maoxiang canyon in Zhidan County, northwest China's Shaanxi Province. The canyon consists of 9 segments with a total length of 12 kilometers. (Xinhua/Tao Ming)

Photo taken on Dec. 17, 2019 shows a view at the Maoxiang canyon in Zhidan County, northwest China's Shaanxi Province. The canyon consists of 9 segments with a total length of 12 kilometers. (Xinhua/Tao Ming)

Photo taken on Dec. 17, 2019 shows a view at the Maoxiang canyon in Zhidan County, northwest China's Shaanxi Province. The canyon consists of 9 segments with a total length of 12 kilometers. (Xinhua/Tao Ming)

Photo taken on Dec. 17, 2019 shows a view at the Maoxiang canyon in Zhidan County, northwest China's Shaanxi Province. The canyon consists of 9 segments with a total length of 12 kilometers. (Xinhua/Tao Ming)

Photo taken on Dec. 17, 2019 shows a view at the Maoxiang canyon in Zhidan County, northwest China's Shaanxi Province. The canyon consists of 9 segments with a total length of 12 kilometers. (Xinhua/Tao Ming)

Photo taken on Dec. 17, 2019 shows a view at the Maoxiang canyon in Zhidan County, northwest China's Shaanxi Province. The canyon consists of 9 segments with a total length of 12 kilometers. (Xinhua/Tao Ming)