Final answer:
France is the country that shares a border with Germany along the Rhine River, which is a critical geographical and historical landmark in Europe.
Step-by-step explanation:
The country that has the Rhine forming part of the border with Germany is France. The Rhine River serves as a significant geographical marker and has historical importance as a border. Throughout history, the Rhine has been a strategic point for commerce, conflict, and cultural exchange. The river is also central to Germany's industrial activity, connecting the southern regions to the rest of Europe. Notably, western France, which includes Strasbourg, the political capital of the EU, is situated along the Rhine, indicating the river's prominence in European politics and economics. In addition, the river's northern path leads to the Netherlands, where it reaches Europe's busiest port of Rotterdam, highlighting its role in the European transportation network.