A river between two countries does not make them distant from each other.
A national border does not have to run as a line across dry land. It can also follow a river. The key is still that the two countries’ territories directly adjoin each other.
A concrete example is Görlitz on the German side and Zgorzelec on the Polish side of the Lusatian Neisse. The two towns cooperate as a European city. That cooperation does not turn them into a single country; it takes place across the German–Polish border.
The other three answers
The incorrect answers are also in Europe, but do not directly border Germany.
Romania
Romania does not share a national border with Germany. A general classification within Europe does not answer the specific border question.
Bulgaria
Bulgaria is also not a direct neighbour of Germany. Check whether the territories directly adjoin, rather than relying on familiar country names.
Greece
Greece is not among the countries sharing a border with Germany. Travel or economic links between countries do not automatically make them direct neighbours.
“European city” describes cooperation, not a new nationality.
The Görlitz/Zgorzelec example explains the neighbouring relationship. It does not mean that everyone there has the same language, background or nationality. Those personal characteristics cannot be inferred from an address or a picture.
The question asks neither for the border’s full history nor its length. First learn the present geographical relationship. Historical changes and specific travel conditions each require additional relevant information.
Germany and Poland · Federal Statistical Office ↗Poland borders Germany; the Neisse can separate and connect neighbours.
Connect the country name with Görlitz/Zgorzelec as one example. A river does not remove the shared border.
Three words for this question
- das Uferriverbank
- The edge of a river or other body of water.
- grenzüberschreitendcross-border
- Taking place across a national border.
- unmittelbardirectly
- Without another territory in between.