Patleyna Reserve was included in the list of protected natural territories in 1948 and in 1979 its area was increased. It was listed in higher category as well-kept reserve with a decision from 1999. Patleyna has an area of 37.80 hectares on which is situated the biggest deposit in Bulgaria of Judas tree (Cercis siliquastrum).
Momin Grad Reserve is situated in Byala Reka village, Varbitza municipality, Shoumen region. It is included in the list of protected natural landmarks in 1960 and was listed in higher category as well-kept reserve in 1999. The reserve is situated in century old beech forest on a territory of 10.90 hectares.
Srebarna Reserve is situated next to the village of Srebarna - on the Danube River, 16 km west of Silistra town. The lake is supplied by karst and rain waters as well as from a Danube feeder. It was declared protected territory in 1948 and was listed in higher category in 2000. Srebarna Reserve has an area of 902.10 hectares. The reserve includes the lake, an island in the Danube and a river branch. Two thirds from the lake is covered by reed. Srebarna is an important ornithological place where the following birds are nesting: Dalmatian pelican (Pelicanus crispus), Glossy Ibis (Plegadis falcinellus), stag of a fellow deer, heron, greylag goose, duck, pochard (Aythya ferina), marsh harrier, etc. There are 150 kinds of birds on the territory of the reserve, 11 kinds of ducks, 20 kinds of amphibians and 30 kinds of mammals. Srebarna was included in the Ramsar Convention and in the list of UNESCO for the world natural heritage and is a biosphere reserve.
