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Map of Bulgaria with the watershed of the river of Struma, the fifth largest river in Bulgaria. Note that part of the watershed is in Greece and Republic of Macedonia hence out of the map.
Карта на България с водосборния басейн на река Струма. Части от водосборната област се намират в Гърция и Република Македония и не са показани на картата.
Author: Petko Yotov, 2005. Work based on a picture by the Institute of water problems, Bulgarian Academy of Sciences 1998.
The source picture was not explicitely into the public domain, but Professor Santurjian, leading the publication stated that their materials can be used without restriction provided that the Institute be properly attributed.
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