The Périgny River is a tributary of the O'Sullivan River, flowing into the Canadian province of Quebec, Canada, or in the administrative regions of: The hydrographic slope of the Périgny River is accessible on the R1018 road (North-South direction) passing on the north-west side of the lake.

The surface of the Périgny River is usually frozen from early November to mid-May, however safe ice circulation is generally from mid-November to mid-April.

The current of the latter flows towards the West, to the East shore of Goéland Lake.

The latter is crossed to the northwest by the Waswanipi River which is a tributary of Matagami Lake.

The toponym "Périgny River" was formalized on December 5, 1968, at the Commission de toponymie du Québec, i.e. at the creation of this commission[3] Download coordinates as: