The Rheider Au () is a river of Schleswig-Holstein, Germany.
The Rheider Au is a tributary of the Treene near Hollingstedt. Its source is on the Schleswig Geest near Schleswig. In the Viking Age the route Eider - Treene - Rheider Au - Schlei served as a navigation way and/or transport or trade route between places to the north and the Baltic Sea, as commercial centres functioned (see Dorestad, Haithabu).
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