The Nation is a municipality in Eastern Ontario, located within Canada's National Capital Region, in the United Counties of Prescott and Russell. Formed in 1998, the municipality consists of the former townships of Caledonia, Cambridge and South Plantagenet, as well as the Village of St. Isidore.

The United Counties of Prescott and Russell is a county located in the Canadian province of Ontario. Its county seat is L'Orignal. The county was created as a result of a merger between Russell County and Prescott County in 1820. It is located in Eastern Ontario, in the wedge-shaped area between the Ottawa River and St. Lawrence River, approximately 55 kilometres (34 mi) east of the City of Ottawa. Under Ontario law, the county is an Upper-tier Municipality.