Bei Zarten im Osten von Freiburg bringen Rotbach (aus dem Höllental) und Wagensteigbach, die Dreisam auf den Weg nach Westen. Ohne die Dreisam gäbe es in Freiburg keine Bächle und kein Dreisamufer-Leben. Die Kelten gaben dem Fluss vor über 2000 Jahren den Namen und er bedeutet „die Schnellfließende“. Die weiteren Zuflüsse wie Brugga, Zastler-, Ibental- und Eschbach entspringen in der Feldbergregion, am Schauinsland und an den Höhen bei St. Peter und St. Märgen. Sie überwinden teils auf wenigen Kilometern über 1000 Höhenmeter bis nach Zarten. Das vereinigte und schnell abfließende Wasser wird dem Namen gerecht. Etwa 40 km sind es dann bis die Dreisam, ab Riegel gemeinsam mit der Elz, nahe Rheinhausen in den Rhein mündet. Schmilzt der Schnee durch viel Regen und Wind, so steigen die Wasser schnell, aber gehen auch geschwind.
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