Тосненский район
The source of the Izhora is located at the village of Skvoritsy, northwest of the town of Gatchina. The Izhora flows to the east, passes at the northern outskirts of Gatchina, and east of Kommunar enters Tosnensky District. There, for a short stretch it makes the border between Saint Petersburg (north) and Leningrad Oblast (south), returns to the oblast and gradually turns north. In Kolpino, the Izhora enters the federal city of Saint Petersburg. There, it flow north and joins the Neva in the settlement of Ust-Izhora.