Lac Rousseau is a Lake located in Lac-Nilgaut; Pontiac, Quebec and has an elevation of 220 meters.

• Latitude: 46° 13' 29'' North   (decimal: 46.2247222)
• Longitude: 76° 55' 19'' West   (decimal: -76.9219444)
• Topography Feature Category: Lake
• Geographical Feature: Lac
• Canadian Province/Territory: Quebec
• Elevation: 220 meters
• Location: Lac-Nilgaut; Pontiac
• Atlas of Canada Locator Map: Lac Rousseau
• GPS Coordinate Locator Map: Lac Rousseau Lat/Long