This nice cover from Belarus depicts 2 stamps celebrating the Nature reserve of "Bielovezhskaya Pushcha" (Bialowieza Puszcza in polish). Białowieża Forest (or Biełaviežskaja Pušča; Polish: Puszcza Białowieska) is one of the last and largest remaining parts of the immense primeval forest that once stretched across the European Plain. The forest is home to 800 European bison, Europe's heaviest land animal. UNESCO's Man and the Biosphere Programme designated the Polish Biosphere Reserve Białowieża in 1976 and the Belarusian Biosphere Reserve Belovezhskaya Puschcha in 1993. The forest has been designated a UNESCO World Heritage Site and an EU Natura 2000 Special Area of Conservation. The World Heritage Committee by its decision of June 2014 approved the extension of the UNESCO World Heritage site "Belovezhskaya Pushcha/Białowieża Forest, Belarus, Poland", which became "Białowieża Forest, Belarus, Poland".
