The Rhine, Rhone, Po, and Danube rivers all have their sources in the Alps.

* Rhine: The Rhine's source is in the Swiss Alps, specifically at the Tomasee, near the Oberalp Pass.

* Rhone: The Rhone originates in the Rhône Glacier in the Swiss Alps.

* Po: The Po's source is in the Cottian Alps, specifically at the Monviso peak in Italy.

* Danube: The Danube's source is in the Black Forest region of the German Alps, at the Donauquelle.