The
Rideau River is an
Eastern Ontario river which flows north from
Upper Rideau Lake and empties into the
Ottawa River at
Rideau Falls in
Ottawa, Ontario. Its length is . The river was given the French name "Rideau" (curtain) after the appearance of this waterfall.The Rideau River and The Rideau Canal are recommended Heritage Fair or Foir du Patrimoine Canadien projects ou projets.