| Ottawa River | |
|---|---|
 The Ottawa River in autumn | |
 Map of the Ottawa River drainage basin | |
| Location | |
| Country | Canada |
| Provinces | Quebec, Ontario |
| Physical characteristics | |
| Source | Lac des Outaouais |
| • location | Lac-Moselle, La Vallée-de-la-Gatineau RCM, Outaouais, Quebec, Canada |
| • coordinates | 47°38′38″N 75°38′35″W / 47.64389°N 75.64306°W |
| Mouth | St. Lawrence River |
• location | Montreal, Quebec and Ottawa, Ontario, Canada |
• coordinates | 45°27′N 74°05′W / 45.450°N 74.083°W |
| Length | 1,271 km (790 mi)[1] |
| Basin size | 146,300 km2 (56,500 sq mi)[1] |
| Width | |
| • maximum | 7,400 m (24,300 ft)[2] |
| Depth | |
| • maximum | 90 m (300 ft)[2] |
| Discharge | |
| • location | Carillon dam |
| • average | 1,950 m3/s (69,000 cu ft/s)[1] |
| • minimum | 749 m3/s (26,500 cu ft/s) |
| • maximum | 5,351 m3/s (189,000 cu ft/s) |
| Basin features | |
| Progression | Saint Lawrence River→ Gulf of Saint Lawrence |
| River system | Saint Lawrence River drainage basin |
 | |
The Ottawa River (French: Rivière des Outaouais, Algonquin: Kichi-Sìbì/Kitchissippi) is a river in the Canadian provinces of Ontario and Quebec. It is named after the Algonquin word 'to trade', as it was the major trade route of Eastern Canada at the time. For most of its length, it defines the border between these two provinces. It is a major tributary of the St. Lawrence River and the longest river in Quebec.