A left tributary of the Fischa, its drainage basin is 348 km2 (134 sq mi).

[2] The sources of the Piesting are the Kalte Gang, the Steinapiesting [de], and the Längapiesting, which begin south of the Schneeberg.

Between the Hohe Mandling [ceb; de; nn; sv; zh] (967 m (3,173 ft)) in the north and the Großer Kitzberg [ceb; de; sv] (771 m (2,530 ft)) in the south, the Piesting breaks through the Quarb [de], a rocky ravine, and flows further eastwards through Markt Piesting and Wöllersdorf into the Vienna Basin.

The valley west of the Thermenlinie [bar; de] (the thermal line at the Vienna Basin) in the Gutenstein Alps is known as the Piesting Valley.

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