Aerial photo of isolated, mysterious Wusulangzi Lake, in Arxan National Forest Park, on May 29. The park is located in the northwest of Hinggan Meng, Inner Mongolia. It is on the border between China and Mongolia.[Photo by Li Renzi/Xinhua]

Luming (Deer's calling) lake in Arxan. [Photo by Li Renzi/Xinhua]

Sapphire Tianchi (Heavenly Lake) in Arxan. [Photo by Li Renzi/Xinhua]

Mysterious beauty of Tianchi (Heavenly Lake) in Arxan. [Photo by Li Renzi/Xinhua]