Big Island is a Island located in Lanark, Ontario.

• Latitude: 44° 45' 51'' North   (decimal: 44.7641666)
• Longitude: 76° 29' 10'' West   (decimal: -76.4861111)
• Topography Feature Category: Island
• Geographical Feature: Island
• Canadian Province/Territory: Ontario
• Location: Lanark
• Atlas of Canada Locator Map: Big Island
• GPS Coordinate Locator Map: Big Island Lat/Long