The Imza River — a left tributary of the The Urga River, belongs to the Pourzhye area and to the basin of the The Sura River River.
The source lies near the village of Pesochnoye in Knyagininsky District of Nizhny Novgorod Region.
It flows into the Urga near the settlement of Krasnaya Gorka in Vorotynsky District.
Length about 95 kilometres.