Its two sources begin near St. Aegyd am Neuwalde and Türnitz respectively. After meeting, they flow through the municipalities of Türnitz, Lilienfeld, Traisen, Wilhelmsburg, and St. Pölten, before meeting the Danube at Traismauer.
The two tributaries originate from close to St. Aegyd am Neuwalde and Türnitz. They then converge through the municipalities of Türnitz, Lilienfeld, Traisen, Wilhelmsburg, and St. Pölten before joining the Danube at Traismauer.