Big Rock is a Shoal located in Renfrew, Ontario and has an elevation of 224 meters.

• Latitude: 45° 27' 25'' North   (decimal: 45.4569444)
• Longitude: 77° 12' 57'' West   (decimal: -77.2158333)
• Topography Feature Category: Shoal
• Geographical Feature: Rock
• Canadian Province/Territory: Ontario
• Elevation: 224 meters
• Location: Renfrew
• Atlas of Canada Locator Map: Big Rock
• GPS Coordinate Locator Map: Big Rock Lat/Long