The Wrześnica is a 49-kilometer (30.4 mi)-long, right (or northern) tributary of the Warta in Poland.[1] Its river basis covers an area of 355 km2. It has its source near Piekary, a suburb of Gniezno. It meets the Warta near the village of Samarzewo. Important cities along the Wrześnica river include Czerniejewo, Września.[2]
Close to the city of Września, the artificial Wrzesińskie Lake was created on the river, colloquially also called the Lipówka Reservoir.