The Rheider Au (Danish: Rejde Å or Spangebæk) is a river of Schleswig-Holstein, Germany.
| Rheider Au (Rejde å, Spangebæk) | |
|---|---|
 | |
Map of the rivers Eider and Treene, Rheider Au and Schlei. | |
| Location | |
| Country | Germany |
| State | Schleswig-Holstein |
| Physical characteristics | |
| Mouth | |
• location | Treene |
• coordinates | 54°26′48″N 9°19′35″E / 54.4467°N 9.3263°E |
| Basin features | |
| Progression | Treene→ Eider→ North Sea |
The Rheider Au is a tributary of the Treene near Hollingstedt. Its source is on the 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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