The current distribution of this tiger subspecies, once including a vast territory of eastern Siberia, of the chinese Manchuria and Corea, is now almost limited to the Russian far east regions of Primorye (Primorski Krai) and Khabarosvki Krai. This suggests the common name of Amur tiger (after the largest river of the region) that is now frequently used to indicate this animal. The current range of Panthera t. altaica actually suggests a less known name, Ussuri tiger, in relation with the major river of Primorye. Today, an estimated number of about 400 individuals is reported to live in the forests of the Sikhote-Alin mountain range, now the largest unfragmented tiger habitat in Asia. A few tigers may also be present on the east Manchurian mountains of China and possibly in the adjacent region of North Corea.