Ottawa is the capital of Canada

and the country's fourth largest municipality, as well as the second largest city in the province of Ontario. It is located in the Ottawa Valley on the eastern edge of the province of Ontario. Ottawa lies on the banks of the Ottawa River, a major waterway that forms the boundary between Ontario and Quebec.

There is no federal capital district in Canada. Ottawa is a municipality within the Province of Ontario. Although it does not constitute a separate administrative district, Ottawa is part of the federally-designated National Capital Region, which includes the neighbouring Quebec municipality of Gatineau. As with other national capitals, the word "Ottawa" is also used to refer by metonymy to the country's federal government, especially as opposed to provincial or municipal authorities.

Ottawa is situated on the south bank of the Ottawa River, and contains the mouths of the Rideau River and Rideau Canal. The oldest part of the city (including what remains of Bytown) is known as Lower Town and occupies an area between the canal and the rivers. Across the canal to the west lies Centretown (often just called "downtown"), which is the city's financial and commercial hub. Between here and the Ottawa River, the slight elevation of Parliament Hill is home to many of the capital's landmark government buildings, and is the Legislative seat of Canada. As of June 29, 2007, the Rideau Canal, which stretches 202 km (126 mi) to Kingston, Fort Henry and four Martello towers in the Kingston area was recognized as a UNESCO World Heritage Site.