Pembroke is a city in the Canadian province of Ontario at the confluence of the Muskrat River and the Ottawa River in the Ottawa Valley. Pembroke is the location of the administrative headquarters of Renfrew County, though the city itself is politically independent. It is 145 kilometres (90 mi) northwest of Ottawa.

The Ottawa Valley is the valley of the Ottawa River, along the boundary between Eastern Ontario and the Outaouais, Quebec, Canada. The valley is the transition between the Saint Lawrence Lowlands and the Canadian Shield. Because of the surrounding shield, the valley is narrow at its western end and then becomes increasingly wide as it progresses eastward. The underlying geophysical structure is the Ottawa-Bonnechere Graben. Approximately 1.3 million people reside in the valley, around 80% of whom reside in Ottawa. The total area of the Ottawa Valley is 2.4 million ha. The National Capital Region area has just over 1.4 million inhabitants in both provinces.