It is the Danube River.
Romania has plains and hills, mountains and rivers, lakes and sea.
Two rivers partially form Illinois State's Eastern boundary. The Wabash River is one river that forms Illinois' boundary. The Ohio River is the other river that forms the state's boundary.
hills and mountains, sea and lakes, rivers, plains
the Delaware river
Carpathian Mountains
rio grande and st.lawrence
Uarl mountains and the Uarl rivers
it doesnt
Most of the northern boundary is formed by the Alps. However, on the Iberian Peninsula, the Pyrenees form another northern border of Southern Europe.
The Atlantic Ocean forms the eastern boundary of the Southeast, while the Gulf of Mexico forms the southern boundary.
The Ural Mountains, The Ural River, and the Caspian Sea
The two rivers that partially form the eastern boundary of the United States are the Mississippi River and the St. Lawrence River. The Mississippi River flows southward from Minnesota to the Gulf of Mexico, serving as a significant boundary for several states. The St. Lawrence River, situated in the northeastern part of the country, forms part of the boundary between the United States and Canada.