Photo taken on June 20, 2017 shows the scenery of Zhagana mountains in Diebu county, Gannan Tibetan autonomous prefecture, Northwest China's Gansu province. Zhagana is a mountainous region on the northeastern rim of the Tibetan Plateau, with an average altitude of 3,500 meters. The region has a unique cultural and natural landscape featuring Tibetan-style villages, primitive forests and mountains. [Photo/Xinhua]