Gatineau is a city in western Quebec, Canada, the fourth largest by population in the province (after Montreal, Quebec City and Laval). It is paired with Ottawa, the capital of Canada. It is situated on the northern bank of the Ottawa River, immediately across from Ottawa, Ontario, and is located within Canada's National Capital Region. Ottawa and Gatineau comprise a single Census Metropolitan Area.
Gatineau is coextensive with a territory equivalent to a regional county municipality (TE) and census division (CD) of the same name, whose geographical code is 81.