Germany has a land border with Denmark.
Germany is the only country to have a land border with Denmark.
Germany is the only country that shares a land border with Denmark. Considering you've tagged Germany in the question, I get a feeling you already knew...
Germany
The only country Denmark has a land border with is Germany to the south.
Germany
Germany has a land boarder with Denmark
Denmark shares a land border with Germany.
The only border to ground land is to Germany. The rest is sea.
Germany shares same land boarder as denmark.
Germany is the only country to border Denmark.
Germany. Sweden lies next to Denmark as well, but it does not border Denmark