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The Aabach (only Aa in earlier times, or Ustener Aa, in order to distinguish it from the Mönchaltorfer Aa) is a river in the canton of Zürich, Switzerland. The river, which has a length of 11.2 kilometres (7.0 mi), flows from the Pfäffikersee to the Greifensee through the steep Aatal (Aa Valley).
References
Aabach (Greifensee) Wikipedia(Text) CC BY-SA