View of Zhagana scenic area in Diebu County, Gansu

Aerial photo taken on Aug. 28, 2021 shows tourists walking on a wooden walkway at Zhagana scenic area in Diebu County of Gannan Tibetan Autonomous Prefecture, northwest China's Gansu Province. (Xinhua/Du Zheyu)

Tourists visit Zhagana scenic area in Diebu County of Gannan Tibetan Autonomous Prefecture, northwest China's Gansu Province, Aug. 28, 2021. (Xinhua/Chen Bin)

Aerial photo taken on Aug. 28, 2021 shows the scenery at Zhagana scenic area in Diebu County of Gannan Tibetan Autonomous Prefecture, northwest China's Gansu Province. (Xinhua/Du Zheyu)

Aerial photo taken on Aug. 28, 2021 shows the scenery at Zhagana scenic area in Diebu County of Gannan Tibetan Autonomous Prefecture, northwest China's Gansu Province. (Xinhua/Chen Bin)

Tourists take pictures at Zhagana scenic area in Diebu County of Gannan Tibetan Autonomous Prefecture, northwest China's Gansu Province, Aug. 28, 2021. (Xinhua/Chen Bin)

Tourists ride horses at Zhagana scenic area in Diebu County of Gannan Tibetan Autonomous Prefecture, northwest China's Gansu Province, Aug. 28, 2021. (Xinhua/Chen Bin)

Tourists visit Zhagana scenic area in Diebu County of Gannan Tibetan Autonomous Prefecture, northwest China's Gansu Province, Aug. 28, 2021. (Xinhua/Chen Bin)

Aerial photo taken on Aug. 28, 2021 shows the scenery at Zhagana scenic area in Diebu County of Gannan Tibetan Autonomous Prefecture, northwest China's Gansu Province. (Xinhua/Chen Bin)