Photo taken on Sept. 13, 2015 shows autumn scenery of Santan Gorge in Arxan of Hinggan League, north China's Inner Mongolia Autonomous Region. Photo: Xinhua

Photo taken on Sept. 13, 2015 shows autumn scenery of Wusulangzi Lake in Arxan of Hinggan League, north China's Inner Mongolia Autonomous Region. Photo: Xinhua 

Photo taken on Sept. 13, 2015 shows autumn scenery of Arxan forest park in Hinggan League, north China's Inner Mongolia Autonomous Region. Photo: Xinhua 

Photo taken on Sept. 13, 2015 shows autumn scenery of Halaha River in Arxan of Hinggan League, north China's Inner Mongolia Autonomous Region. Photo: Xinhua 

Photo taken on Sept. 13, 2015 shows autumn scenery of Tianchi Lake in Arxan of Hinggan League, north China's Inner Mongolia Autonomous Region. Photo: Xinhua 

Photo taken on Sept. 13, 2015 shows autumn scenery of Arxan forest park in Hinggan League, north China's Inner Mongolia Autonomous Region. Photo: Xinhua 

Photo taken on Sept. 13, 2015 shows autumn scenery of Dujuan Lake in Arxan of Hinggan League, north China's Inner Mongolia Autonomous Region. Photo: Xinhua