Trethewey Lake is a Lake located in Timiskaming, Ontario and has an elevation of 388 meters.

• Latitude: 47° 26' 53'' North   (decimal: 47.4480555)
• Longitude: 80° 29' 39'' West   (decimal: -80.4941666)
• Topography Feature Category: Lake
• Geographical Feature: Lake
• Canadian Province/Territory: Ontario
• Elevation: 388 meters
• Location: Timiskaming
• Atlas of Canada Locator Map: Trethewey Lake
• GPS Coordinate Locator Map: Trethewey Lake Lat/Long