The Gatineau River is a river in western Quebec, Canada, which rises in lakes north of the Baskatong Reservoir and flows south to join the Ottawa River at the city of Gatineau, Quebec. The river is 386 kilometres (240 mi) long and drains an area of 23,700 square kilometres (9,200 sq mi).

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.