The Siberian tiger (Panthera tigris tigris), also called Amur tiger, is a tiger population inhabiting mainly the Sikhote Alin mountain region in southwest Primorye Province in the Russian Far East. The Siberian tiger once ranged throughout Korea, north-eastern China, Russian Far East, and eastern Mongolia. In 2005, there were 331–393 adult and subadult Siberian tigers in this region, with a breeding adult population of about 250 individuals. The population had been stable for more than a decade due to intensive conservation efforts, but partial surveys conducted after 2005 indicate that the Russian tiger population was declining. This was followed up by a more detailed census which revealed there was a total population of 562 wild Siberian tigers in Russia.