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| Alster | |
|---|---|
 | |
  Location of mouth in Bavaria | |
| Location | |
| Country | Germany |
| States | Bavaria and Thuringia |
| Physical characteristics | |
| Mouth | |
• location | Itz |
• coordinates | 50°07′46″N10°52′16″E / 50.12944°N 10.87111°E |
| Length | 20.7 km (12.9 mi) [1] |
| Basin features | |
| Progression | Itz→ Main→ Rhine→ North Sea |
The Alster is a river of Bavaria and of Thuringia, Germany. It is a right-bank tributary of the Itz, which it joins near Kaltenbrunn.
The name is derived from the Germanic *al-stra- 'growing, swelling'.
