The season migratory way of birds called Via Pontika passes over Northeastern Bulgaria. Important stops of this way are lake Srebarna, Shabla and Durankulak.
Lake Srebarna lies at a distance of 17 km west of the town of Silistra near the Danube River. It has a protected guarded area of 600 hectares and a buffer zone of 540 hectares. The depth of the lake varies between 1 and 3 meters. Here nest about 100 species of birds and over 200 species fly over the area or stop to feed here. The region around Lake Srebarna is a habitat of 44 species of mammals, 23 species of fish, 10 types of amphibians, 11 types of reptiles and more than 300 higher plants. Here is the only one for Bulgaria colony of curly-headed pelicans.
Srebarna was proclaimed for a reserve in 1948 and in 1983 the lake was included in the UNESCO Cultural and Natural Heritage List.
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