A river of eastern Switzerland, western Austria, and southeast Germany flowing about 515 km (320 mi) to the Danube River. Its lower course forms part of the German-Austrian border.

• 因河：位于瑞士以东，奥地利以西，德国东南的一条河流，流程515公里(320英里），汇入多瑙河。其下游形成德奥边界的一部分