The Grand River watershed lies between Georgian Bay and Lake Erie in Ontario, Canada, between longitudes 79° 30´ and 80° 57´ West, and latitudes 42° 51´ and 44° 13´ North. The Grand River, and its four major tributaries, the Nith, Conestogo, Eramosa and Speed Rivers, is the largest river system entering Lake Erie.
The headwaters of the Grand River rise north-east of the village of Dundalk on some of the highest land in southern Ontario. The river drops from an elevation of 526 metres above sea level to 174 metres above sea level on its 298 kilometres (185 miles) journey to Lake Erie.
The catchment basin is the largest in southern Ontario, draining an area of 6,800 square kilometres. The land area of the watershed has an overall length of 190 kilometres, and an average width of 35 kilometres.
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