With matching stamp:Bulgarian regions-North Eastern Bulgaria (Issued 24-11-2010)
Defenitives:Thracian gold treasure of Panagurishte (Issued 15-11-1999)
The Srebarna Nature Reserve is a freshwater lake bordering to the Danube river over 600 ha. It is the breeding ground of almost 100 species of bird, many of which are rare or endangered It isAlso a bird migration route between Europe and Africa Some 80 other bird species migrate and seek refuge there every winter. Among the most interesting bird species are the Dalmatian pelican, great egret, night heron, purple heron, glossy ibis and white spoonbill, white-tailed eagle, little cormorant.
The reserve was included in the UNESCO World Heritage List in 1983.