The great sheets of ice in Tianchi, or Heavenly Lake – set in the crater of Changbai Mountain, a dormant volcano – have started to thaw recently. Tianchi has been frozen for more than 200 days. The Changbai Mountains range, located in Northeast China's Jilin province, is a national 5A scenic area, a member of the UNESCO Man and Biosphere Reserve Program and an international A-level nature reserve. [Photo/WeChat account of Changbaishan Wenlyu]

A wondrous moment is captured at Tianchi, or Heavenly Lake, in Jilin province [Photo/WeChat account of Changbaishan Wenlyu]

This interior view shows the fascinating exhibits on offer in the Changbai Mountain Mammoth Theme Park. [Photo/WeChat account of Changbaishan Wenlyu]