The Ustermer Aa or Aabach is a river in the Canton of Zürich, Switzerland. The river, which has a length of 11,2 km, flows from the Pfäffikersee to the Greifensee through the deep Aatal (Aa Valley).
Aabach on Lake Pfäffikon
Aabach reservoir in Wetzikon
Aabach nearby Aathal-Seegräben (Aa Valley)
Ustermer Aa in Uster
Ustermer Aa on Lake Greifen
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