| Tonnerre | |
| Map: | Saguenaymap.png |
| Subdivision Type1: | Country |
| Subdivision Name1: | Canada |
| Subdivision Type2: | Province |
| Subdivision Name2: | Quebec |
| Subdivision Type3: | Region |
| Subdivision Name3: | Saguenay-Lac-Saint-Jean |
| Length: | 12.6km (07.8miles)[1] |
| Source1: | Île Ronde Lake |
| Source1 Location: | Lac-Ashuapmushuan, Quebec, MRC Le Domaine-du-Roy, Saguenay-Lac-Saint-Jean, Quebec |
| Source1 Coordinates: | 49.4369°N -74.0594°W |
| Source1 Elevation: | 406m (1,332feet) |
| Mouth: | Normandin River |
| Mouth Location: | Lac-Ashuapmushuan, Quebec, MRC Le Domaine-du-Roy, Saguenay-Lac-Saint-Jean, Quebec |
| Mouth Coordinates: | 49.3522°N -74.0764°W |
| Mouth Elevation: | 383m (1,257feet) |
The rivière au Tonnerre (English: Tonnerre River) is a tributary of the Normandin River, flowing into the unorganized territory of Lac-Ashuapmushuan, Quebec in the Regional County Municipality (RCM) of Le Domaine-du-Roy, in the administrative region of Saguenay-Lac-Saint-Jean, in Quebec, in Canada.
The Tonnerre River flows entirely in the Township of Ducharme. Forestry is the main economic activity of this valley; recreational tourism activities, second.
The route 167 (northwesterly) connecting Chibougamau to Saint-Félicien, Quebec cuts the middle of the Tonnerre River. TheCanadian National Railway runs along this road.
The surface of the Tonnerre River is usually frozen from early November to mid-May, however, safe ice circulation is generally from mid-November to mid-April.
The term "Normandin" is a family name of French origin.
The toponym "Rivière au Tonnerre" was formalized on June 8, 1971, at the Commission de toponymie du Québec.[2]