Big Rideau Lake is a lake in the municipalities of Tay Valley and Drummond/North Elmsley, Lanark County and Rideau Lakes, United Counties of Leeds and Grenville in Eastern Ontario, Canada. The lake is on the border between the two counties, 72km to the southwest of Ottawa. It is 32km long and is 6km wide, is much narrower at its northeastern end than at its southwestern end, and is part of the Saint Lawrence River drainage basin. It is the largest lake on the Rideau Canal, which was designated a UNESCO world heritage site in 2007.HydrologyThe primary inflow, at the southwest, is the Rideau River/Rideau Canal from Upper Rideau Lake via The Narrows channel and the Narrows lock and control structures. A second primary inflow is Black Creek at the west. The primary outflow, at the north, is also the Rideau River/Rideau Canal which leads via a channel to Lower Rideau Lake. The Rideau River and Canal flow to the Ottawa River and then to the Saint Lawrence River.
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