Rideau River
 The Rideau River is a Southern Ontario river which flows north from Upper Rideau Lake and empties into the Ottawa River at Rideau Falls in Ottawa Ontario. Its length is 146 km. The river was given the French name Rideau (curtain of water) after the appearance of this waterfall.The Rideau Canal which allows travel from Ottawa to the city of Kingston Ontario on Lake Ontario was formed by joining the Rideau River with the Cataraqui River.