A Siberian tiger rests under a tree at a park in Harbin, Heilongjiang province, July 17, 2017. [Photo/Xinhua]

Location: Northeast China's Jilin and Heilongjiang provinces

Total area: 14,600 square kilometers

Wild Siberian tigers are one of the endangered wild animals, with only 500 estimated to be living in the world. Siberian leopards are one of the most endangered large cat subspecies, with only about 50 wild ones left -- most of them living at the border of China and Russia.

In 1998 and 1999, only 12 to 16 wild Siberian tigers and seven to 12 wild Siberian leopards lived in Northeast China, the number rising to 27 and 42, respectively, by 2014 after conservation efforts.