Lake Simcoe

Located 50 km north of Toronto, Lake Simcoe is a little more than an hour's drive from half the population in Ontario. The watershed has a total land and water surface area of 3,303 square kilometres of which the lake occupies about 20 percent or 722 square kilometres. Lake Simcoe is part of the Trent Severn Waterway connecting Lake Ontario to Georgian Bay and is southern Ontario's largest body of water (excluding the Great Lakes).

The land portion of the watershed is approximately 2,581 square kilometres and is drained by 35 tributary rivers, with five major tributaries accounting for over 60 percent of the total area. Most of these rivers originate along the southern boundary of the watershed in the prominent physiographic feature known as the Oak Ridges Moraine. These rivers then drain in a northerly direction before discharging to Lake Simcoe.