Eramosa River
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The Eramosa River is a river in Wellington County in western Ontario which rises near Erin, Ontario and flows southwest through the city of Guelph, where it joins the Speed River, which then enters the Grand River in Cambridge.
The river flows through an area covered with several hundred glacial potholes near Rockwood, one of the largest being the Devil's Well, 13 m deep and 6 m wide.