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Flooded Eramosa River in Guelph in early spring
|⁃ location||Near Erin, Ontario|
|Speed River at Guelph, Ontario|
The Eramosa River is a river in Wellington County in southwestern 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.  Many believe the river is named after the Indigenous Mississauga word um-ne-mo-sah, meaning "dead dog." 
The river flows through an area covered with several hundred glacial potholes near Rockwood, one of the largest being the Devil's Well, 13.1 metres (43 ft) deep, 6.4 metres (21 ft) wide at the top and 4.9 metres (16 ft) at its base. 
- "Low water response: Speed and Eramosa Rivers". grandriver.ca. Grand River Conservation Authority. Archived from the original on 13 March 2005. Retrieved 31 May 2010.
- Mercer, Greg (3 August 2018). "The Watershed: Paddling Eramosa, the 'little gem'". TheRecord.com. Retrieved 8 September 2018.
- Morgan, Alan (May 2002). "Glacial Potholes at Rockwood" (PDF). Grand Actions. Grand River Conservation Authority. 7 (4): 2. Archived from the original (PDF) on 8 November 2005. Retrieved 31 May 2010.
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