| Pat River | |
| Subdivision Type1: | Country |
| Subdivision Name1: | Canada |
| Subdivision Type2: | Province |
| Subdivision Name2: | Quebec |
| Subdivision Type3: | Region |
| Subdivision Name3: | Estrie |
| Subdivision Type4: | MRC |
| Subdivision Name4: | Le Haut-Saint-François Regional County Municipality |
| Subdivision Type5: | Municipality |
| Subdivision Name5: | Sainte-Élizabeth-de-Warwick, Sainte-Séraphine and Sainte-Clotilde-de-Horton |
| Length: | 18.4km (11.4miles) |
| Source1: | Agricultural streams |
| Source1 Location: | Sainte-Élizabeth-de-Warwick |
| Source1 Coordinates: | 45.8765°N -72.1124°W |
| Source1 Elevation: | 118m (387feet) |
| Mouth: | Nicolet Southwest River |
| Mouth Location: | Sainte-Clotilde-de-Horton |
| Mouth Coordinates: | 45.9644°N -72.2353°W |
| Mouth Elevation: | 83m (272feet) |
| Progression: | Nicolet Southwest River, Nicolet River, St. Lawrence River |
| Tributaries Left: | (upstream) ruisseau Lampron-Raiche. |
| Tributaries Right: | (upstream) ruisseau Lainesse, ruisseau Laroche, ruisseau Fafard, |
The rivière à Pat (in English: Pat River) is a tributary on the east bank of the Nicolet Southwest River. It crosses the municipalities of Sainte-Élizabeth-de-Warwick, Sainte-Séraphine and Sainte-Clotilde-de-Horton in the Arthabaska Regional County Municipality (MRC), in the administrative region of Estrie, in Quebec, in Canada.
The main neighboring hydrographic slopes of the Pat river are:
The Rivière à Pat originates from various streams in the municipality of Sainte-Élizabeth-de-Warwick, very close to the limit of the municipality of Kingsey Falls.
From its source, Pat's River flows on in the following segments:
The Rivière à Pat drains on the east bank of the Nicolet Southwest River. Its confluence is located upstream from Île Lemire and upstream from the village of Sainte-Clotilde-de-Horton.
The toponym "Rivière à Pat" was formalized on September 5, 1985, at the Commission de toponymie du Québec.[2]