On February 27, 2013 the Russian post will continue the series "World Natural Heritage of Russia" by issue of a postage block devoted to the biosphere reserve Ubsu-Nur Depression located in the Republic of Tyva. The Ubsu-Nur Depression is considered surprising meeting of ecosystems and is object of the World heritage of UNESCO.

Design: О. Ivanova.
Size of Block: 100 х 70 mm.
Edition: 80 000 copies.

The nature reserve "Ubsu-Nur Depression" is created in 1993 for protection and studying of unique and various ecosystems of a hollow - from the mountain tundra to deserts. The Ubsu-Nur Depression represents the natural bowl of 600 by 150 kilometres in size which has been fenced off from world around by ridges in the centre of the Asian continent. The main unique natural feature of Ubsu-Nur Depression is existence of almost all landscapes of a moderate belt of Earth on very limited space. At the bottom of a hollow the small lake Ubsu-Nur remained. The scientists consider that the lake once was part of the sea which gradually dried up, having left the mountains maleficiated by sea waves.