There are 66 rivers in Bulgaria.
Daniube, Iskar, Maritsa
Most of the Northern border of Bulgaria is defined by the Danube. A few other big rivers run trough the country, although none of them floatable - Maritsa, Struma, Iskar, to name a few.
Bulgaria is named after a tribe called the Bulgars.
There is no river called Bulgaria here
There is no place in Bulgaria called VOLGA
Maritza, Iskar, Ropotamo, Tundja, Struma and Dunav (Danube)
Yes, Bulgaria's currency is called the Lev.
Yes many people may often get confused that Bulgaria is situated in Russia as the Russian and Bulgarian Emmbasseys are the same although the european country of bulgaria previously known as the republic of bulgaria is no longer in bulgaria as of 1968 when bulgaria became free from russia, there is still the village of bulgaria in russia which was named after Bulgaria itself. So the answer is yes there is a place in russia called bulgaria. Hope this helps.
Romania's eastern border is the Black Sea (234 km), Prut + Danube rivers (aprox. 600 km). Bulgaria's eastern border is the Black Sea (354 km)/
Svetets
Bulgarian was always called Bulgaria България since its formation in 681 by Pra-Bulgarians (bulgars from Altai)