This cover from Russia depicts a complete set issued in 2008 celebrating the UNESCO Nature World Heritage Site "Central Sikhote-Alin". The Sikhote-Alin is a mountain range in Primorsky and Khabarovsk Krais, Russia, extending about 900 kilometres to the northeast of the Russian Pacific seaport of Vladivostok. The highest summits are Tordoki Yani at 2,077 metres above sea level, Ko Mountain (2,003 m) in Khabarovsk Krai and Anik Mountain (1,933 m) in Primorsky Krai. In 2001, UNESCO placed "Central Sikhote-Alin" onto the World Heritage List, citing its importance for "the survival of endangered species such as the scaly-sided (Chinese) merganser, Blakiston's fish-owl and the Amur tiger". The World Heritage site had a total area of 16,319 square kilometres, of which the terrestrial core zone of Sikhote-Alin Zapovednik comprised 3,985 square kilometres. In 2018, the World heritage site was expanded by 11,605 square kilometres by including Bikin National Park under the name "Bikin River Valley".
