| Rivière aux Trembles | |
| Name Other: | Old name: "Pémonca River" |
| Subdivision Type1: | Country |
| Subdivision Name1: | Canada |
| Subdivision Type2: | Province |
| Subdivision Name2: | Quebec |
| Subdivision Type3: | Region |
| Subdivision Name3: | Saguenay–Lac-Saint-Jean |
| Subdivision Type4: | Regional County Municipality |
| Subdivision Name4: | Le Domaine-du-Roy Regional County Municipality |
| Length: | 23.4km (14.5miles) |
| Source1: | Little lake |
| Source1 Location: | Lac-Ashuapmushuan |
| Source1 Coordinates: | 48.7667°N -73.0072°W |
| Source1 Elevation: | 440m (1,440feet) |
| Mouth: | Ashuapmushuan River |
| Mouth Location: | Lac-Ashuapmushuan |
| Mouth Coordinates: | 48.7458°N -72.7986°W |
| Mouth Elevation: | 272m (892feet) |
| Progression: | Pémonca River, Ashuapmushuan River, Lac Saint-Jean, Saguenay River, Saint Lawrence River |
| Tributaries Left: | (upstream) discharge from some lakes, including Dalle, Estillac, at Dinner and Faillant, discharge from Lake Commana, discharge from several lakes including Pacaus, Rénald and Figeac, discharge from a small lake, discharge from Lake Allegrin. |
| Tributaries Right: | (upstream) stream, discharge from several lakes including Tesser and at Valère, stream, discharge from Lake Provin, stream, discharge from Lake Quenne, stream, discharge from a set of lakes including Auvray, Cassis and Dazé, discharge from Lake Aubord. |
The rivière aux Trembles (English: Aspen River) is a tributary of Pémonca River, flowing in the unorganized territory of Lac-Ashuapmushuan, in the Le Domaine-du-Roy Regional County Municipality, in the administrative region of Saguenay–Lac-Saint-Jean, in the province from Quebec, to Canada.
The Trembles river valley is mainly served by forest roads. Its course more or less marks the southern limit of the Ashuapmushuan Wildlife Reserve.[1]
Forestry (mainly forestry) is the main economic activity in this valley; recreational tourism activities, second, main because of the Ashuapmushuan wildlife reserve.
The Trembles river has its source at the mouth of a small lake (altitude:). This source is located in a forest area in the municipality of La Doré, at:
From its source, the Trembles river flows on with a drop of, especially in agricultural and village areas at the end of the route, depending on the segments following:
The Rivière aux Trembles pours into the bottom of a narrow bay to the south-east of Lac à la Truite, which turns out to be one of the two head lakes of the Pémonca river. This confluence is located at:
From the mouth of the Trembles river, the current of the Pémonca River descends on the course of the Pémonca River, the current descends the course of the Ashuapmushuan river on, then crosses Lake Saint-Jean east on (i.e. its full length), follows the course of the Saguenay River via the Petite Décharge on eastwards to Tadoussac where it merges with the estuary of Saint Lawrence.[2]
The toponym "rivière Pémonca" was formalized on December 5, 1968, at the Place Names Bank of the Commission de toponymie du Québec.[3]