Sinclair Lake is a Lake located in Northumberland, New Brunswick and has an elevation of 369 meters.

• Latitude: 47° 3' 13'' North   (decimal: 47.0534833)
• Longitude: 66° 34' 37'' West   (decimal: -66.5768315)
• Topography Feature Category: Lake
• Geographical Feature: Lake
• Canadian Province/Territory: New Brunswick
• Elevation: 369 meters
• Location: Northumberland
• Atlas of Canada Locator Map: Sinclair Lake
• GPS Coordinate Locator Map: Sinclair Lake Lat/Long