Cedardale is a community on the Rideau River in eastern Ontario, Canada. The Rideau River is a Canadian River which flows north from Upper Rideau Lake and empties into the Ottawa River at Rideau Falls Ontario (ɒnˈtɛrioʊ is a province located in the central part of Canada, the largest by population and second largest after Quebec Country to "Dominion of Canada" or "Canadian Federation" or anything else please read the Talk Page It is located within the City of Ottawa jurisdiction. Ottawa (ˈɒtəwə or sometimes /ˈɒtəwɑː/ is the Capital of Canada and the country's fourth largest municipality.