What river originating in the Alps has had a major influence on European history?

The Danube River, which originates in the Alps, has significantly influenced European history as a vital trade route and cultural boundary. Flowing through ten countries, it has been central to the development of cities and economies along its banks, including Vienna and Budapest. Historically, it served as a strategic military front and a conduit for the movement of peoples, ideas, and goods, shaping the political landscape of Europe. Its importance continues today, both economically and culturally, as it connects diverse regions and communities.