Ustermer Aa
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).
Aabach on Lake Pfäffikon
Aabach reservoir in Wetzikon
Aabach nearby Aathal-Seegräben (Aa Valley)
Usterner Aa in Uster
Usterner Aa on Lake Greifen
Coordinates: 47°21′N 8°41′E / 47.350°N 8.683°E
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Wikipedia