Aerial photo taken on June 13, 2019 shows the view of Guanshan Grassland at Longxian County in Baoji, northwest China's Shaanxi Province. (Xinhua/Tao Ming)

Aerial photo taken on June 12, 2019 shows the view of Guanshan Grassland at Longxian County in Baoji, northwest China's Shaanxi Province. (Xinhua/Tao Ming)

Aerial photo taken on June 12, 2019 shows the view of Guanshan Grassland at Longxian County in Baoji, northwest China's Shaanxi Province. (Xinhua/Tao Ming)

Aerial photo taken on June 12, 2019 shows a RV camp hotel on Guanshan Grassland at Longxian County in Baoji, northwest China's Shaanxi Province. (Xinhua/Tao Ming)

Aerial photo taken on June 12, 2019 shows the view of Guanshan Grassland at Longxian County in Baoji, northwest China's Shaanxi Province. (Xinhua/Tao Ming)

Aerial photo taken on June 12, 2019 shows the view of Guanshan Grassland at Longxian County in Baoji, northwest China's Shaanxi Province. (Xinhua/Tao Ming)

Aerial photo taken on June 12, 2019 shows a RV camp hotel on Guanshan Grassland at Longxian County in Baoji, northwest China's Shaanxi Province. (Xinhua/Tao Ming)

Aerial photo taken on June 12, 2019 shows the view of Guanshan Grassland at Longxian County in Baoji, northwest China's Shaanxi Province. (Xinhua/Tao Ming)

Aerial photo taken on June 13, 2019 shows the view of Guanshan Grassland at Longxian County in Baoji, northwest China's Shaanxi Province. (Xinhua/Tao Ming)

Aerial photo taken on June 12, 2019 shows the view of Guanshan Grassland at Longxian County in Baoji, northwest China's Shaanxi Province. (Xinhua/Tao Ming)

Herds of cattle and horses are seen in the rain at the Guanshan Grassland at Longxian County in Baoji, northwest China's Shaanxi Province, June 12, 2019. (Xinhua/Tao Ming)

Aerial photo taken on June 13, 2019 shows the view of Guanshan Grassland at Longxian County in Baoji, northwest China's Shaanxi Province. (Xinhua/Tao Ming)

Aerial photo taken on June 12, 2019 shows the view of Guanshan Grassland at Longxian County in Baoji, northwest China's Shaanxi Province. (Xinhua/Tao Ming)

Aerial photo taken on June 12, 2019 shows the view of Guanshan Grassland at Longxian County in Baoji, northwest China's Shaanxi Province. (Xinhua/Tao Ming)

Aerial photo taken on June 12, 2019 shows a town on Guanshan Grassland at Longxian County in Baoji, northwest China's Shaanxi Province. (Xinhua/Tao Ming)

Aerial photo taken on June 13, 2019 shows the view of Guanshan Grassland at Longxian County in Baoji, northwest China's Shaanxi Province. (Xinhua/Tao Ming)

Herds of cattle and horses run in the rain at the Guanshan Grassland at Longxian County in Baoji, northwest China's Shaanxi Province, June 12, 2019. (Xinhua/Tao Ming)

Farmyards are seen at the Guanshan Grassland at Longxian County in Baoji, northwest China's Shaanxi Province, June 13, 2019. (Xinhua/Tao Ming)

Aerial photo taken on June 12, 2019 shows the view of Guanshan Grassland at Longxian County in Baoji, northwest China's Shaanxi Province. (Xinhua/Tao Ming)

People ride horse on the Guanshan Grassland at Longxian County in Baoji, northwest China's Shaanxi Province, June 12, 2019. (Xinhua/Tao Ming)