An aerial drone photo taken on early June 21, 2025 shows a view of the Saihanba National Forest Park in Chengde City, north China's Hebei Province. (Photo by Liu Mancang/Xinhua)

An aerial drone photo taken on early June 21, 2025 shows a view of the Saihanba National Forest Park in Chengde City, north China's Hebei Province. (Photo by Liu Mancang/Xinhua)

An aerial drone photo taken on early June 21, 2025 shows a view of the Saihanba National Forest Park in Chengde City, north China's Hebei Province. (Photo by Liu Mancang/Xinhua)

An aerial drone photo taken on early June 21, 2025 shows a view of the Saihanba National Forest Park in Chengde City, north China's Hebei Province. (Photo by Liu Mancang/Xinhua)