The Ottawa River 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.
Country: Canada
Provinces: Quebec, Ontario
Source: Lac des Outaouais
Mouth: St. Lawrence River
Length: 1,271 km (790 mi)
Basin size: 146,300 km² (56,500 sq mi)
Progression: Saint Lawrence River→ Gulf of Saint Lawrence
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