O'Brien Lake is a Lake located in Thunder Bay, Ontario and has an elevation of 213 meters.

• Latitude: 48° 45' 23'' North   (decimal: 48.7563888)
• Longitude: 87° 38' 53'' West   (decimal: -87.6480555)
• Topography Feature Category: Lake
• Geographical Feature: Lake
• Canadian Province/Territory: Ontario
• Elevation: 213 meters
• Location: Thunder Bay
• Atlas of Canada Locator Map: O'Brien Lake
• GPS Coordinate Locator Map: O'Brien Lake Lat/Long