Aatal (Valley)

It is situated between the towns of Wetzikon and Uster in the canton of Zürich, Switzerland.

Through the valley flows the river Aabach, which starts at the effluence of the southern end of the Pfäffikersee and then enters Wetzikon where the river makes a U-turn in the middle of the town towards a southwestern direction before it enters the valley.

After the valley of about 4 kilometres (2.5 mi) the Abbach enters Uster, where it also used to be called Usterner Aa, runs through Uster in a western direction before it enters the Greifensee about in the middle of the lake's eastern shore, near Niederuster.

The hamlet of Aathal in the middle of the valley belongs to the municipality of Seegräben.

In addition to the heavy traffic on the national expressway between Uster and Wetzikon the three S-Bahn railway lines S5, S14, and S15 traverse the valley, each at a half-hourly clock-face schedule so that in average every 5 minutes a train passes through the valley.