The main watersheds neighboring the Trompeuse River are: • north side:
lac aux Écorces, lac à la Culotte,
Pikauba River,
rivière aux canots, Panache Lake; • east side: Fortin stream, Cloutier stream, Huit lake, Charland lake,
rivière aux Canots; • south side: Araigne brook, Gros-Jos brook,
rivière aux Écorces North-East,
rivière aux Écorces, • west side:
rivière aux Écorces, Lac Érin, Lac Samson, Lac Monbrion,
lac aux Écorces, Salvail stream. The Trompeuse River originates at Trompeur Lake (length: ; altitude: ) in a forest area in the
Laurentides Wildlife Reserve. This source is located at: • east of Lac du Chasseur; • south-east of a curve in the course of the
rivière aux Canots; • east of Lac à la Culotte; • north-east of
lac aux Écorces which is crossed by the
rivière aux Écorces; • north-west of the confluence of the Rivière Trompeuse and
rivière aux Écorces; • north-west of the course of the
rivière aux Écorces North-East; • of the hamlet
Mont-Apica where the
route 169 passes. The Trompeuse river flows on the northeast bank of the
rivière aux Canots. This confluence is located at: • north-east of Lac Érin; • south-east of
lac aux Écorces; • east of
Métascouac Lake; • north-east of a curve of the
Métabetchouane River; • south-west of
route 169; • south of the confluence of the
Pikauba River and the
rivière aux Écorces; • south-east of the confluence of the
Pikauba River and
Kenogami Lake; • southwest of the confluence of the
Chicoutimi River and the
Saguenay River in the
Chicoutimi sector of the city of
Saguenay (city). From the mouth of the Trompeuse river, the current successively follows the course of the
rivière aux Écorces on generally towards the north, the course of the
Pikauba River on generally to the north, crosses
Kenogami Lake on north-east to
barrage de Portage-des-Roches, then follows the course of the
Chicoutimi River on towards the east, then the northeast and the course of the Saguenay river on towards the east until
Tadoussac where it merges with the
Saint Lawrence estuary. == Toponymy ==