The river Danube (Dunărea in the Romanian language)
Romania has borders with Hungary, Serbia, Bulgaria, Moldova, Ukraine.
Danube.
Bulgaria
This is the boundary with Ukraine: mountains and the river Tisa.
This boundary is mainly Danube; and a in the South of Dobrogea a terrestrial border.
It is the Danube River.
The river Danube and the South Dobrogea.
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The Potomac river
The western boundary of Romania is with Hungary.
The southern half of the eastern boundary of Alabama is the Chattahoochee River.
The Mediterranean Sea
The 42nd northern latitude
The northern boundary of Bulgaria that separates it from Romania is the Danube River. The Danube River is a very important river that flows through several countries before it reaches the Mediterranean Ocean.
The Ohio River forms Ohio's southern border.