the iskar river
Danube
Iskar
There is no river called Bulgaria here
From Rila mountain crossing the full length of Bulgaria to be poured in BLACK SEA. Longest river in Bulgaria
The Danube River forms part of the boundary between Bulgaria and Romania.
This river is called Danube. Its a northern border to Bulgaria and for Romania the south bound.
The norther border of Bulgaria is delineated by the Danube river. I don't know of any other river that goes "through" BG.
Black Widow
Daniube
Romania and Bulgaria border one another and are separated by the Danube. There is no country 'in the middle'.
Iskar river (if we dont count International river Danube)
Turkey and Greece
no its in hungary
The Ohio River.