The main hydrographic slopes near the "Salmon Port River" are: • North side:
Noire River,
Port aux Quilles River,
Rivière de la Baie des Rochers,
Saguenay River; • East side: Port aux Persil Cove,
St. Lawrence River; • South side: Marguerite Creek,
Port au Saumon River,
Rivière à la Loutre,
Malbaie River; • West side: Salmon Port River. The Port-au-Persil River rises from a mountain stream (elevation: ) in a forest area southeast of "lac des Rats Musqués" (lake of the Musk Rats). From its source, the course of the Port aux Persil river descends by traveling according to the following segments: • southeasterly, to a bend in a river where a stream flows (from the north); • to the south, in particular passing under Hydro-Québec power lines, then to the east, winding up to
Route 138 that it cuts at north of the hamlet Saint-Chrétien; • south to a river bend where a stream flows (from the west); • east through a series of rapids and waterfalls, to the east shore of Port Anse à Persil which is interelected in the
Gulf of St. Lawrence. ==Toponymy==